R. Noé et al., “COMPARISON OF POLARIZATION HANDLING METHODS IN COHERENT OPTICAL-SYSTEMS,”10.1109/50.90934__JOURNAL OF LIGHTWAVE TECHNOLOGY, vol. 9, no. 10, pp. 1353–1366, 1991, doi:10.1109/50.90934 .

H.-S. Kitzerow and P. P. Crooker, “Polymer-dispersed cholesteric liquid crystals - challenge for research and application,”10.1080/00150199108226040__Ferroelectrics, vol. 122, no. 1, pp. 183–196, 1991, doi:10.1080/00150199108226040 .

H.-S. Kitzerow, P. Crooker, and G. Heppke, “Line shapes of field-induced blue-phase-III selective reflections,”10.1103/physrevlett.67.2151__Physical Review Letters, vol. 67, no. 16, pp. 2151–2154, 1991, doi:10.1103/physrevlett.67.2151 .

H.-S. Kitzerow, B. Jérôme, and P. Pieranski, “Strain-induced anchoring transitions,”10.1016/0378-4371(91)90423-a__Physica A: Statistical Mechanics and its Applications, vol. 174, no. 1, pp. 163–194, 1991, doi:10.1016/0378-4371(91)90423-a .

H.-S. Kitzerow, “The Effect of Electric Fields on Blue Phases,”10.1080/00268949108035659__Molecular Crystals and Liquid Crystals, vol. 202, no. 1, pp. 51–83, 1991, doi:10.1080/00268949108035659 .

R. Lasser and M. Rösler, “Linear mean estimation of weakly stationary stochastic processes under the aspects of optimality and asymptotic optimality,”10.1016/0304-4149(91)90095-t__Stochastic Processes and their Applications, vol. 38, no. 2, pp. 279–293, 1991, doi:10.1016/0304-4149(91)90095-t .

H.-S. Kitzerow, H. Schmid, and G. Heppke, “Chirale Flüssigkristalle - Selektive Reflexion in Phasen ohne Spiegelsymmetrie,” Labor 2000, Sonderausgabe der Zeitschrift LaborPraxis, Vogel Verlag, München, pp. 6–11, 1991.

K. Huber, “Interactions in mixed interfaces of binary surfactant solutions,”10.1016/0021-9797(91)90164-4__Journal of Colloid and Interface Science, vol. 147, no. 2, pp. 321–332, 1991, doi:10.1016/0021-9797(91)90164-4 .

K. Huber, “Calcium-induced shrinking of polyacrylate chains in aqueous solution,”10.1021/j100140a046__The Journal of Physical Chemistry, vol. 97, no. 38, pp. 9825–9830, 1991, doi:10.1021/j100140a046 .

H. Schroeter-Wittke, “Massenliturgie - Medienliturgie. Hermeneutische Überlegungen zu den Schlußversammlungen des Deutschen Evangelischen Kirchentages,” in Praktisch-theologische Hermeneutik, D. Zilleßen, S. Alkier, R. Koerrenz, and H. Schroeter-Wittke, Eds. Rheinbach-Merzbach: CMZ-Verlag, 1991, pp. 483–502.