G. Heppke, H.-S. Kitzerow, D. Lötzsch, and Ch. Papenfuß, “Blue phase mixtures exhibiting low fractions of a chiral compound experimental observation of some unusual properties,”10.1080/02678299008047356__Liquid Crystals, vol. 8, no. 3, pp. 407–418, 1990, doi:10.1080/02678299008047356 .
LibreCat: /record/40067
DOI: 10.1080/02678299008047356

R. Noé et al., “OPTICAL AMPLIFIER WITH 27-DB DYNAMIC-RANGE IN A COHERENT TRANSMISSION-SYSTEM,”10.1109/68.47067__IEEE PHOTONICS TECHNOLOGY LETTERS, vol. 2, no. 2, pp. 120–121, 1990, doi:10.1109/68.47067 .
LibreCat: /record/38338
DOI: 10.1109/68.47067

R. Noé et al., “OPTICAL AMPLIFIER WITH 27-DB DYNAMIC-RANGE IN A COHERENT TRANSMISSION-SYSTEM,”10.1109/68.47067__IEEE PHOTONICS TECHNOLOGY LETTERS, vol. 2, no. 2, pp. 120–121, 1990, doi:10.1109/68.47067 .
LibreCat: /record/38288
DOI: 10.1109/68.47067

R. Noé, H. RODLER, G. GAUKEL, A. EBBERG, and F. AURACHER, “POLARIZATION-INDEPENDENT AND PATTERN-INDEPENDENT OPTICAL FSK HETERODYNE SYSTEM USING DATA-INDUCED POLARIZATION SWITCHING,”10.1049/el:19900119__ELECTRONICS LETTERS, vol. 26, no. 3, pp. 176–177, 1990, doi:10.1049/el:19900119 .
LibreCat: /record/38498
DOI: 10.1049/el:19900119

R. Noé, H. RODLER, G. GAUKEL, B. NOLL, and A. EBBERG, “HIGH-PERFORMANCE, 2-CHANNEL OPTICAL FSK HETERODYNE SYSTEM WITH POLARIZATION DIVERSITY RECEIVER,”10.1049/el:19900717__ELECTRONICS LETTERS, vol. 26, no. 15, pp. 1109–1110, 1990, doi:10.1049/el:19900717 .
LibreCat: /record/38501
DOI: 10.1049/el:19900717

H.-S. Kitzerow, P. P. Crooker, S. L. Kwok, J. Xu, and G. Heppke, “Dynamics of blue-phase selective reflections in an electric field,”10.1103/physreva.42.3442__Physical Review A, vol. 42, no. 6, pp. 3442–3448, 1990, doi:10.1103/physreva.42.3442 .
LibreCat: /record/40335
DOI: 10.1103/physreva.42.3442

H.-S. Kitzerow, P. P. Crooker, S. L. Kwok, and G. Heppke, “A blue phase with negative dielectric anisotropy in an electric field. Statics and dynamics,”10.1051/jphys:0199000510120130300__Journal de Physique, vol. 51, no. 12, pp. 1303–1312, 1990, doi:10.1051/jphys:0199000510120130300 .
LibreCat: /record/40340
DOI: 10.1051/jphys:0199000510120130300

H.-S. Kitzerow, G. Heppke, H. Schmid, B. Jérôme, and P. Pieranski, “First optical observation of Kossel diagrams in chiral smectic phases,”10.1051/jphys:0199000510180208700__Journal de Physique, vol. 51, no. 18, pp. 2087–2099, 1990, doi:10.1051/jphys:0199000510180208700 .
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DOI: 10.1051/jphys:0199000510180208700

H. Schroeter-Wittke, “Im Advent kommt Gott uns entgegen. Anmerkungen und Anregungen für Verkündigung und Liturgie in der Vorweihnachtszeit,” Zeitschrift für Gottesdienst und Predigt, vol. 8, no. 6, pp. 7–13, 1990.
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H. Schroeter-Wittke, H. Schröer, and E. Bethge, “Erben sind wir auf jeden Fall. Über Forschung, Vermittlung und Gedenken. Ein Interview mit Eberhard Bethge ,” Der Evangelische Erzieher, vol. 42, pp. 453–463, 1990.
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J. Hilgert, “Applications of Lie Semigroups in Analysis,” in The Analytical and Topological Theory of Semigroups, K. H. Hofmann and et al., Eds. Berlin: De Gruyter, 1990.
LibreCat: /record/51484

J. Hilgert and K. H. Hofmann, “On the Causal Structure of Homogeneous Manifolds,” Math. Scand., vol. 67, pp. 119–144, 1990.
LibreCat: /record/51446