Glitzky's homepage Publications
Projects Preprints Presentations

  • D. Abdel, A. Glitzky, M. Liero
    Analysis of a drift-diffusion model for perovskite solar cells,
    WIAS Preprint 3073 (2023)

  • A. Glitzky, M. Liero
    A bulk-surface model for the electrothermal feedback in large-area organic light-emitting diodes,
    PAMM Proceedings in Applied Mathematics & Mechanics (MS-Nr: pamm.202300018, 2023),
    https://doi.org/10.1002/pamm.202300018

  • A. Glitzky, M. Liero
    A drift-diffusion based electrothermal model for organic thin-film devices including electrical and thermal environment,
    to appear in Z. Angew. Math. Mech., published online http://doi.org/10.1002/zamm.202300376
    WIAS Preprint 3012 (2023)

  • A. Kirch, A. Fischer, M. Liero, J. Fuhrmann, A. Glitzky, S. Reineke
    Electrothermal tristability causes sudden burn-in phenomena in organic LEDs,
    Adv. Funct. Mater., 31 (2021) p. 2106716, /DOI 10.1002/adfm.202106716.

  • A. Glitzky, M. Liero, G. Nika
    A coarse-grained electrothermal model for organic semiconductor devices, Math. Meth. Appl. Sci., 45 (2022) pp. 4809--4833,
    WIAS Preprint 2822 (2021)

  • A. Glitzky, M. Liero, G. Nika
    Analysis of a bulk-surface thermistor model for large-area organic LEDs, Portugaliae Mathematica, 78:2 (2021) pp. 187--210,
    WIAS Preprint 2757 (2020) with title An effective bulk-surface thermistor model for large-area organic light-emitting diodes.

  • A. Glitzky, M. Liero, G. Nika
    A hybrid model for the electrothermal behavior of semiconductor devices,
    PAMM Proc. Appl. Mech. (2020) /DOI 10.1002/pamm.202000028.

  • A. Glitzky, M. Liero, G. Nika
    Dimension reduction of thermistor models for large-area organic light-emitting diodes,
    DCDS-S, 14:11 (2021) pp. 3953--3971,
    WIAS Preprint 2719 (2020)

  • J. Fuhrmann, D. H. Doan, A. Glitzky, M. Liero, G. Nika
    Unipolar drift-diffusion simulation of S-shaped current-voltage relations for organic semiconductor devices, in: R. Klöfkorn, E.Keilegavlen, F. Radu, J. Fuhrmann (eds) Finite Volumes for Complex Applications IX - Methods, Theoretical Aspects, Examples: FVCA 9, Bergen, Norway, June 2020, Springer Proceedings in Mathematics & Statistics, vol. 323. Springer, Cham, pp. 625--633,
    WIAS Preprint 2660 (2019)

  • A. Glitzky, M. Liero, G. Nika
    Analysis of a hybrid model for the electro-thermal behavior of semiconductor heterostructures,
    J. Math. Anal. Appl., 507 (2022) p. 125815, https://doi.org/10.1016/j.jmaa.2021.125815,
    WIAS Preprint 2636 (2019)

  • D. H. Doan, A. Fischer, J. Fuhrmann, A. Glitzky, M. Liero
    Drift-diffusion simulation of S-shaped current-voltage relations for organic semiconductor devices,
    Journal of Computational Electronic, 19:3 (2020) pp. 1164--1174,
    WIAS Preprint 2630 (2019)

  • Y. Zheng, A. Fischer, M. Sawatzki, D. H. Doan, M. Liero, A. Glitzky, S. Reineke, S. C. B. Mannsfeld
    Introducing pinMOS memory: a novel, non-volatile organic memory device,
    Adv. Funct. Mater. 2019, 1907119, DOI: 10.1002/adfm.201907119

  • A. Glitzky, M. Liero, G. Nika
    An existence result for a class of electrothermal drift-diffusion models with Gauss--Fermi statistics for organic semiconductors,
    Analysis and Applications, 19:2 (2021) pp. 275--304,
    WIAS Preprint 2593 (2019)

  • A. Kirch, A. Fischer, M. Liero, J. Fuhrmann, A. Glitzky, S. Reineke
    Experimental proof of Joule heating-induced switched-back regions in OLEDs, Light: Science & Applications 9:5, 2020.

  • A. Glitzky, M. Liero
    Drift-diffusion problems with Gauss--Fermi statistics and field-dependent mobility for organic semiconductor devices,
    PAMM Proc. Appl. Mech. (2019) /DOI 10.1002/pamm.201900050.

  • F. M. Sawatzki, D. H. Doan, H. Kleemann, M. Liero, A. Glitzky, Th. Koprucki, K. Leo
    Balance of horizontal and vertical charge transport in organic field-effect transistors,
    Phys. Rev. Applied, 10:034069, 2018.

  • A. Glitzky, M. Liero
    Instationary drift-diffusion problems with Gauss--Fermi statistics and field-dependent mobility for organic semiconductor devices,
    Comm. Math. Sci., 17 (2019) pp. 33--59,
    WIAS Preprint 2523 (2018)

  • A. Fischer, M. Pfalz, K. Vandewal, M. Liero, A. Glitzky, S. Lenk, S. Reineke
    Full electrothermal OLED model including nonlinear self-heating effects,
    Phys. Rev. Applied, 10:014023, 2018.

  • H. D. Doan, A. Glitzky, M. Liero
    Analysis of a drift-diffusion model for organic semiconductor devices,
    Z. Angew. Math. Phys., 70 (2019) pp. 55,
    WIAS Preprint 2493 under title Drift-diffusion modeling, analysis and simulation of organic semiconductor devices, (2018)

  • M. Liero, J. Fuhrmann, A. Glitzky, Th. Koprucki, A. Fischer, S. Reineke
    3D electrothermal simulations of organic LEDs showing negative differential resistance,
    Opt. Quantum Electron., 49 (2017), pp. 330/1--330/8, DOI 10.1007/s11082-017-1167-4,
    WIAS Preprint 2420 (2017)

  • M. Liero, J. Fuhrmann, A. Glitzky, Th. Koprucki, A. Fischer, S. Reinecke
    Modeling and Simulation of Electrothermal Feedback in Large-area Organic LEDs,
    in: Proceedings of the 17th International Conference on Numerical Simulation of Optoelectronic Devices, NUSOD 2017,
    24--28 July 2017, J. Piprek, M. Willatzen, eds., IEEE Conference Publications Management Group, Piscataway, NJ, USA, 2017, pp. 105--106. here

  • J. Fuhrmann, A. Glitzky, M. Liero
    Hybrid finite-volume/finite-element schemes for p(x)-Laplace thermistor models,
    In: Cancès C., Omnes P. (eds) Finite Volumes for Complex Applications VIII - Hyperbolic, Elliptic and Parabolic Problems. FVCA 2017,
    Springer Proceedings in Mathematics & Statistics, vol 200. Springer, Cham, pp. 397--405,
    WIAS Preprint 2378 (2017)

  • J. Fuhrmann, A. Glitzky, M. Liero
    Electrothermal description of organicsSemiconductor devices by p(x)-Laplace thermistor models,
    PAMM Proc. Appl. Mech. 17, 701--702 (2017)/DOI 10.1002/pamm.201710319. here

  • M. Liero, A. Glitzky, Th. Koprucki, J. Fuhrmann, A. Fischer
    A PDE model for electrothermal feedback in organic semiconductor devices,
    In: P. Quintela, P. Barral, D. Gomez, F. J. Pena, J. Rodriguez, P. Salgado, M. E. Vazquez-Mendez (eds)
    Progress in Industrial Mathematics at ECMI 2016, Springer International Publishing, Cham, 2017, pp. 99--106,
    Matheon Preprint 1112 (2016)

  • F. Kaschura, A. Fischer, M. P. Klinger, D. H. Doan, Th. Koprucki, A. Glitzky, D. Kasemann, J. Widmer, K. Leo
    Operation mechanism of high performance organic permeable base transistors with an insulated and perforated base electrode,
    J. Appl. Phys., 120 (2016) pp. 094501/1--094501/8.

  • M. Bulíček, A. Glitzky, M. Liero
    Thermistor systems of p(x)-Laplace-type with discontinuous exponents via entropy solutions, DCDS-S, 10 (2017) pp. 697--713,
    WIAS Preprint 2247 (2016)

  • D. Peschka, M. Thomas, A. Glitzky, R. Nürnberg, M. Virgelio, S. Guha, Th. Schroeder, G. Capellini, Th. Koprucki
    Robustness analysis of a device concept for edge-emitting lasers based on strained germanium,
    Optical and Quantum Electronics (OQEL), 48 (2016) pp.156/1--156/7.

  • M. Bulíček, A. Glitzky, M. Liero
    Systems describing electrothermal effects with p(x)-Laplacian-like structure for discontinuous variable exponents,
    SIAM J. Math. Anal., 48 (2016) pp. 3496--3514,
    WIAS Preprint 2206 (2016)

  • A. Glitzky, M. Liero
    Analysis of p(x)-Laplace thermistor models describing the electrothermal behavior of organic semiconductor devices,
    Nonlinear Analysis: Real World Applications, 34 (2017) pp. 536--562,
    WIAS Preprint 2143 (2015)

  • G. Capellini, M. Virgilio, Y. Yamamoto, L. Zimmermann, B. Tillack, D. Peschka, M. Thomas, A. Glitzky, R. Nürnberg, K. Gärtner, Th. Koprucki, T. Schroeder
    Modeling of an Edge-Emitting strained-Ge laser, Optical Society of America, Advanced Solid State Lasers, ATu2A.19, 2015 DOI: 10.1364/ASSL.2015.ATu2A.19

  • D. Peschka, M. Thomas, A. Glitzky, R. Nürnberg, K. Gärtner, M. Virgelio, S. Guha, Th. Schroeder, G. Capellini, Th. Koprucki
    On device concepts for CMOS-compatible edge-emitters based on strained germanium,
    in: Proceedings of the 15th International Conference on Numerical Simulation of Optoelectronic Devices, NUSOD 2015,
    J. Piprek, W. Yuh-Renn, eds., IEEE Conference Publications Management Group, Piscataway, 2015, pp. 129--130.

  • A. Fischer, Th. Koprucki, A. Glitzky, M. Liero, K. Gärtner, J. Hauptmann, S. Reinicke. D. Kasemann, B. Lüssem, K. Leo, R. Scholz
    OLEDs: light-emitting thin film thermistors revealing advanced self-heating effects
    in: Proc. SPIE, 9566 (2015) pp. 95661A-1--95661A-7.

  • D. Peschka, M. Thomas, A. Glitzky, R. Nürnberg, K. Gärtner, M. Virgilio, S. Guha, Th. Schroeder, G. Capellini, Th. Koprucki
    Modeling of edge-emitting lasers based on tensile strained Germanium microstripes,
    IEEE Photonics Journal 7:1502115/1--1502115/15 (2015), doi:10.1109/JPHOT.2015.2427093

  • M. Liero, Th. Koprucki, A. Fischer, R. Scholz, A. Glitzky
    p-Laplace thermistor modeling of electrothermal feedback in organic semiconductor devices,
    Z. Angew. Math. Phys., 66 (2015) pp. 2957--2977,
    WIAS Preprint 2082 (2015)

  • A. Fiebach, A. Glitzky
    Uniform estimate of the relative free energy by the dissipation rate for finite volume discretized reaction-diffusion systems,
    In: Finite Volumes for Complex Applications VII - Methods and Theoretical Aspects, J. Fuhrmann, M. Ohlberger and C. Rohde (eds.),
    vol. 77 of Springer Proceedings in Mathematics & Statistics, Springer, Heidelberg, 2014, pp. 275--283,
    WIAS Preprint 1934 (2014)

  • A. Glitzky, A. Mielke, L. Recke, M. Wolfrum, S. Yanchuk
    Mathematics for optoelectronic devices,
    In: MATHEON -- Mathematics for Key Technologies, M. Grötschel, D. Hömberg, J. Sprekels, V. Mehrmann et al. (eds.), 1 of
    EMS Series in Industrial and Applied Mathematics, European Mathematical Society Publishing House, Zurich, 2014, pp. 243--256.

  • A. Fischer, Th. Koprucki, K. Gärtner, M. Tietze, J. Brückner, B. Lüssem, K. Leo, A. Glitzky, R. Scholz
    Feel the heat: Nonlinear electrothermal feedback in Organic LEDs,
    Adv. Funct. Mater., 24, issue 22 (2014) pp. 3367--3374, WIAS Preprint 1839 (2013)

  • A. Glitzky, K. Gärtner, J. Fuhrmann, Th. Koprucki, A. Fischer, B. Lüssem, K. Leo, R. Scholz,
    Electro-thermal modeling of organic semiconductors describing negative differential resistance induced by self-heating,
    in: Proceedings of the 13th International Conference on Numerical Simulation of Optoelectronic Devices, NUSOD 2013,
    19--22 August 2013, J. Piprek, L. Chrostowski, eds., IEEE Conference Publications Management Group, Piscataway, NJ, USA, 2013, pp. 77--78. here

  • A. Fiebach, A. Glitzky, A. Linke
    Convergence of an implicit Voronoi finite volume method for reaction-diffusion problems,
    Numer. Methods Partial Differential Eq., 32 (2016) pp. 141--174,
    WIAS Preprint 1827 (2013)

  • A. Fischer, P. Pahner, B. Lüssem, K. Leo, R. Scholz, Th. Koprucki, K. Gärtner, A. Glitzky
    Self-heating, bistability, and thermal switching in organic semiconductors,
    Phys. Rev. Lett., 110 (2013) pp. 126601/1--126601/5,
    WIAS Preprint 1735 (2012)

  • A. Fiebach, A. Glitzky, A. Linke
    Uniform global bounds for solutions of an implicit Voronoi finite volume method for reaction-diffusion problems,
    Numerische Mathematik, 13(128) (2014) pp. 31--72,
    WIAS Preprint 1718 (2012)

  • A. Fischer, P. Pahner, B. Lüssem, K. Leo, R. Scholz, Th. Koprucki, J. Fuhrmann, K. Gärtner, A. Glitzky
    Self-heating effects in organic semiconductor crossbar structures with small active area,
    Org. Electron., 13(11) (2012) pp. 2461--2468,

  • A. Fischer, P. Pahner, B. Lüssem, K. Leo, R. Scholz, T. Koprucki, J. Fuhrmann, K. Gärtner, A. Glitzky
    Self-heating effects in organic semiconductor devices enhanced by positive temperature feedback,
    WIAS Preprint 1693 (2012)

  • A. Glitzky
    An electronic model for solar cells including active interfaces and energy resolved defect densities,
    SIAM J. Math. Anal., 44 (2012) pp. 3874--3900,
    WIAS Preprint 1663 (2011)

  • A. Glitzky, A. Mielke
    A gradient structure for systems coupling reaction-diffusion effects in bulk and interfaces,
    Z. Angew. Math. Phys., 64 (2013) pp. 29--52,
    WIAS Preprint 1603 (2011)

  • A. Glitzky, J. A. Griepentrog
    On discrete Sobolev-Poincaré inequalities for Voronoi finite volume approximations,
    in: Finite volumes for complex applications VI: Problems and perspectives, J. Fort, J. Fürst, J. Halama, R. Herbin,
    F. Hubert, eds., Springer Proceedings in Mathematics 4, Springer, Heidelberg, 2011, pp. 533--541.

  • A. Glitzky
    Analysis of electronic models for solar cells including energy resolved defect densities,
    Math. Methods Appl. Sci. 34 (2011) pp. 1980--1998,
    WIAS Preprint 1524 (2010)

  • A. Glitzky
    Uniform exponential decay of the free energy for Voronoi finite volume discretized reaction-diffusion systems,
    Math. Nachr. 284 (2011) pp. 2159--2174,
    WIAS Preprint 1443 (2009)

  • A. Glitzky, J. A. Griepentrog
    Discrete Sobolev-Poincaré inequalities for Voronoi finite volume approximations,
    SIAM J. Numer. Anal. 48 (2010) pp. 372--391,
    WIAS Preprint 1429 (2009)

  • A. Glitzky, K. Gärtner
    Existence of bounded steady state solutions to spin-polarized drift-diffusion systems,
    SIAM J. Math. Anal. 41 (2010) pp. 2489--2513,
    WIAS Preprint 1357 (2008)

  • A. Glitzky
    Analysis of a spin-polarized drift-diffusion model,
    Adv. Sci. Appl.18 (2008) pp. 401--427,
    WIAS Preprint 1300 (2008)

  • A. Glitzky
    Analysis of spin-polarized drift-diffusion models,
    in: PAMM (Proceedings in Applied Mathematics and Mechanics), Volume 8, Issue 1, Special Issue: GAMM
    Annual Meeting 2008, Bremen, Wiley-VCH Verlag, Weinheim, 2008, pp. 10717--10718.

  • A. Glitzky
    Exponential decay of the free energy for discretized electro-reaction-diffusion systems,
    Nonlinearity 21 (2008) pp. 1989--2009,
    WIAS Preprint 1291 (2008)

  • A. Glitzky, K. Gärtner
    Energy estimates for continuous and discretized electro-reaction-diffusion systems,
    Nonlinear Analalysis 70 (2009) pp. 788--805,
    WIAS Preprint 1222 (2007)

  • A. Glitzky
    Energy estimates for reaction-diffusion processes of charged species,
    in: PAMM (Proceedings in Applied Mathematics and Mechanics), Volume 7, Issue 1, Special Issue:
    ICIAM 2007, Zurich, Wiley-VCH Verlag, Weinheim, 2007, pp. 2040055--2040056.

  • A. Glitzky, R. Hünlich
    Stationary solutions to an energy model for semiconductor devices where the equations are defined on different domains,
    Math. Nachr. 281 (12) (2008) pp. 1676--1693,
    WIAS Preprint 1173 (2006)

  • A. Glitzky
    Energy estimates for electro-reaction-diffusion systems with partly fast kinetics,
    DCDS-A, 25 (2009) pp. 159--174,
    WIAS Preprint 1158 (2006)

  • M. Radziunas, A. Glitzky, U. Bandelow, M. Wolfrum, U. Troppenz, J. Kreissl, W. Rehbein
    Improving the modulation bandwidth in semiconductor lasers by passive feedback, IEEE J. Select. Topics Quantum Electron. 13 (1) (2007) pp. 136--142,
    WIAS Preprint 1149 (2006)

  • U. Troppenz, J. Kreissl, W. Rehbein, C. Bornholdt, T. Gaertner, M. Radziunas, A. Glitzky, U. Bandelow, M. Wolfrum
    40 Gb/s directly modulated InGaAsP passive feedback DFB laser, in: Proceedings of the 32nd European Conference on optical Communication (ECOC 2006)

  • A. Glitzky
    Energy models where the equations are defined on different domains,
    in: PAMM (Proceedings in Applied Mathematics and Mechanics), Special Issue: GAMM Annual Meeting 2006, Berlin, Wiley-VCH Verlag, Weinheim, 2007, pp. 629--630. (DOI: 10.1002/pamm200610295)

  • A. Glitzky, R. Hünlich
    Resolvent estimates in W 1,p related to strongly coupled linear parabolic systems with coupled nonsmooth capacities, Math. Methods Appl. Sci., 30 (17) (2007) pp. 2215--2232,
    WIAS Preprint 1086 (2006)

  • M. Radziunas, U. Bandelow, M. Wolfrum, A. Glitzky, R. Hünlich, U. Troppenz, J. Kreissl
    Design of multisection semiconductor laser for 40 Gb/s direct modulation, in: Proceedings of 31st European Conference on Optical Communication
    (ECOC) 2005, 31st European Conference on Optical Communication (ECOC) 2005, Glasgow, UK, September 25-29, 2005

  • A. Glitzky, R. Hünlich
    Stationary energy models for semiconductor devices with incompletely ionized impurities, ZAMM 11 (2005), pp. 778--792,
    WIAS Preprint 1001 (2005)

  • A. Glitzky, R. Hünlich
    Stationary solutions of two-dimensional heterogeneous energy models with multiple species, Banach Center Publ. 66 (2004), pp. 135--151,
    WIAS Preprint 896 (2003)

  • A. Glitzky
    Electro-reaction-diffusion systems with nonlocal constraints, Mathematische Nachrichten 277 (2004), 14--46,
    WIAS Preprint 840 (2003)

  • A. Glitzky, R. Hünlich
    Global existence result for pair diffusion models, SIAM Journal on Mathematical Analysis, Vol. 36, No. 4 (2005), pp. 1200--1225,
    WIAS Preprint 784 (2002)

  • A. Glitzky
    Elektro-Reaktions-Diffusionssysteme mit nichtglatten Daten, Habilitationsschrift, Humboldt-Universität zu Berlin, 2001, Logos-Verlag, 2002

  • R. Hünlich, G. Albinus, H. Gajewski, A. Glitzky, W. Röpke, J. Knopke
    Modelling and simulation of power devices for high-voltage integrated circuits, Mathematics - Key Technology for the Future.
    Joint Projects Between Universities and Industry, W. Jäger, H.-J. Krebs, eds., Springer-Verlag Berlin Heidelberg, 2003, pp. 401--412,
    WIAS Preprint 578 (2000)

  • W. Merz, A. Glitzky
    Single dopant diffusion in semiconductor technology, Math. Meth. Appl. Sci. 27 (2004), pp. 133--154,
    SFB-438 Preprint 0011 (2000)

  • A. Glitzky, R. Hünlich
    Electro-reaction-diffusion systems in heterostructures,
    WIAS Report 19 (2000)

  • A. Glitzky, R. Hünlich
    Global properties of pair diffusion models, Adv. Math. Sci. Appl. 11 (2001) pp.293--321,
    WIAS Preprint 587 (2000)

  • W. Merz, A. Glitzky, R. Hünlich, K. Pulverer
    Strong solutions for pair diffusion models in homogeneous semiconductors,
    Nonlinear Analysis: Real World Applications 2 (2001) pp. 541--567,
    SFB-438 Preprint 9921 (1999)

  • R. Hünlich, A. Glitzky
    On energy estimates for electro-diffusion equations arising in semiconductor technology,
    Partial differential equations, Theory and numerical solution (W. Jäger, J. Necas, O. John, K. Najzar, J. Stara eds.),
    Chapman & Hall/CRC, 2000 pp. 158--174,
    WIAS Preprint 429 (1998)

  • A. Glitzky, R. Hünlich
    Electro-reaction-diffusion systems including cluster reactions of higher order,
    Math. Nachr. 216 (2000) pp. 95--118,
    WIAS Preprint 428 (1998)

  • A. Glitzky, R. Hünlich
    Global estimates and asymptotics for electro-reaction-diffusion systems in heterostructures,
    Appl. Anal. 66 (1997) pp. 205--226,
    WIAS Preprint 338 (1997)

  • R. Hünlich, A. Glitzky, J. Griepentrog, W. Röpke
    Zu einigen Fragen der Modellierung und Simulation bei der Entwicklung von SiGe-Heterojunction-Bipolartransistoren,
    in: Mathematik - Schlüsseltechnologie für die Zukunft (K.-H. Hoffmann, W. Jäger, T. Lohmann, H. Schunck, eds.), Springer, 1997 pp. 303--313,
    WIAS Preprint 224 (1996)

  • A. Glitzky, K. Gröger, R. Hünlich
    Free energy and dissipation rate for reaction diffusion processes of electrically charged species,
    Appl. Anal. 60 (1996) pp. 201--217,
    WIAS Preprint 207 (1995)

  • A. Glitzky, R. Hünlich
    Electro-reaction-diffusion systems for heterostructures,
    in: Free boundary problems and applications (M. Niezgodka, P. Strzelecki, eds.), Addison Wesley Longman, 1996 pp. 305--313

  • A. Glitzky, R. Hünlich
    Energetic estimates and asymptotics for electro-reaction-diffusion systems,
    Z. Angew. Math. Mech. 77 (1997) pp. 823--832,
    WIAS Preprint 168 (1995)

  • A. Glitzky, K. Gröger, R. Hünlich
    Discrete-time methods for equations modelling the transport of foreign-atoms in semiconductors,
    Nonlinear Anal. 28 (1997) pp. 463--487,
    revised version of Rothe's method for equations modelling transport of dopants in semiconductors
    WIAS Preprint 75 (1993)

  • A. Glitzky, K. Gröger, R. Hünlich
    Existence, uniqueness and asymptotic behaviour of solutions to equations modelling transport of dopants in semiconductors, in:
    Special topics in semiconductor analysis (Edited by J. Frehse and H. Gajewski), Bonner Mathematische Schriften 258 (1994) pp. 49--78

  • A. Glitzky
    Stability of orbits of O(2) x Z2 -equivariant bifurcation problems with variational structure, Nonlinear Anal. 20 (1993) pp. 1079--1094

  • A. Glitzky
    Bifurkationsprobleme mit O(2) x Z2 -Symmetrie im drei- und vierdimensionalen Verzweigungsfall,
    Dr.rer.nat. Dissertation, Humboldt-Universität zu Berlin, Berlin, 1989