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 .

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 .

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 .

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 .

K. Schlegel-Matthies, Erstellung einer Ton-Dia-Schau zum Einsatz im schulischen Unterricht für den Kreis Lippe zum 40. Jubiläum des Art. 3 Abs. 2 Grundgesetz “Männer und Frauen sind gleichberechtigt.” 1989.

G. Heppke, B. Jéròme, H.-S. Kitzerow, and P. Pieranski, “Observation of a hexagonal blue phase in systems with negative dielectric anisotropy,”10.1080/02678298908026387__Liquid Crystals, vol. 5, no. 3, pp. 813–828, 1989, doi:10.1080/02678298908026387 .

G. Heppke, B. Jérôme, H.-S. Kitzerow, and P. Pieranski, “Electrostriction of the cholesteric blue phases BPI and BPII in mixtures with positive dielectric anisotropy,”10.1051/jphys:0198900500190299100__Journal de Physique, vol. 50, no. 19, pp. 2991–2998, 1989, doi:10.1051/jphys:0198900500190299100 .

G. Heppke, B. Jérôme, H.-S. Kitzerow, and P. Pieranski, “Electrostriction of BPI and BPII for blue phase systems with negative dielectric anisotropy,”10.1051/jphys:01989005005054900__Journal de Physique, vol. 50, no. 5, pp. 549–562, 1989, doi:10.1051/jphys:01989005005054900 .

T. K. Halstead, C. Schmidt, H. W. Spiess, R. Schoellhorn, W. Mueller-Warmuth, and H. Moeller, “Magnetic-field-induced orientation of crystallites in powders of layered intercalation compounds detected by NMR,”10.1021/j100337a003__The Journal of Physical Chemistry, vol. 92, no. 26, pp. 7167–7168, 1988, doi:10.1021/j100337a003 .

C. Schmidt, B. Blümich, and H. W. Spiess, “Deuteron two-dimensional exchange NMR in solids,”10.1016/0022-2364(88)90219-3__Journal of Magnetic Resonance (1969), vol. 79, no. 2, pp. 269–290, 1988, doi:10.1016/0022-2364(88)90219-3 .

R. Bigga, “Studium Arbeitslehre - Rückblick mit Ausblick,” in Arbeitslehre / Polytechnik: Ein Beitrag zur Neuen Allgemeinbildung. Die Geschichte von Arbeit, Technik und Produktion im Unterricht, G. D. Duismann and K. Struve, Eds. Oldenburg, 1988, pp. 63–72.

R. Bigga and U. Danker, “Die Schleswig-Holsteinische Volkszeitung 1892 bis 1968 - Facetten aus ihrer Geschichte,” Beirat für Geschichte der Arbeiterbewegung und Demokratie in Schleswig-Holstein, vol. 3, pp. 427–436, 1988.

R. Bigga, U. Danker, and P. Bruhn, “Der VZ - Verlag in Photographien,” Beirat für Geschichte der Arbeiterbewegung und Demokratie in Schleswig-Holstein, vol. 3, pp. 359–379, 1988.

H.-S. Kitzerow, G. Heppke, F. Oestreicher, H.-S. Kitzerow, and M. Krumrey, “Blue phase liquid crystal system, method of operation and its use .” 1988.

G. Heppke, H.-S. Kitzerow, F. Oestreicher, S. Quentel, and A. Ranft, “Electrooptic Effect in a Non-Polar Nematic Discotic Liquid Crystal,”10.1080/01406566.1988.10767023__Molecular Crystals and Liquid Crystals Letters, vol. 6, no. 3, pp. 71–79, 1988, doi:10.1080/01406566.1988.10767023 .

C. Schmidt, B. Blümich, S. Wefing, S. Kaufmann, and H. W. Spiess, “Molecular motions from two-dimensional NMR of powders: Comparison of rotational jumps and diffusive reorientations,”10.1002/bbpc.19870911113__Berichte der Bunsengesellschaft für physikalische Chemie, vol. 91, no. 11, pp. 1141–1145, 1987, doi:10.1002/bbpc.19870911113 .

R. Bigga, “Anschauliches Lernen im Museum. ,” in Allgemeinbildung und Arbeit, Technik, Wirtschaft - Innovationen in Curriculum und Schul-Praxis., Oldenburg: GATWU, 1987, pp. 120–127.

G. Heppke, H.-S. Kitzerow, and M. Krumrey, “Angular Dependence of Blue Phase Selective Reflection in the Electric Field,”10.1080/00268948708074802__Molecular Crystals and Liquid Crystals Incorporating Nonlinear Optics, vol. 150, no. 1, pp. 265–276, 1987, doi:10.1080/00268948708074802 .

C. Schmidt, S. Wefing, B. Blümich, and H. W. Spiess, “Dynamics of molecular reorientations: direct determination of rotational angles from two-dimensional NMR of powders,”10.1016/0009-2614(86)80431-6__Chemical Physics Letters, vol. 130, no. 1–2, pp. 84–90, 1986, doi:10.1016/0009-2614(86)80431-6 .

R. Bigga and R. Oberliesen, “Geschlechtsspezifische Arbeitsteilung und technische Innovation - Neue Technologien, Frauenerwerbsarbeit und historisch-genetisches Lernen über Arbeit und Technik. ,” in Neue Technologien und technisch-ökonomische Bildung., Bad Salzdetfurth : GATWU, 1986, pp. 253–270.