Baena, Maria J., Julio Buey, Pablo Espinet, Heinz-Siegfried Kitzerow, and Gerd Heppke. “Metallomesogens with a Cholesteric Mesophase.”https://doi.org/10.1002/anie.199312011__Angewandte Chemie International Edition in English 32, no. 8 (1993): 1201–3.https://doi.org/10.1002/anie.199312011 .

Kitzerow, Heinz-Siegfried, P. P. Crooker, and G. Heppke. “Chromaticity of Polymer-Dispersed Cholesteric Liquid Crystals.”https://doi.org/10.1080/02678299208029037__Liquid Crystals 12, no. 1 (1992): 49–58.https://doi.org/10.1080/02678299208029037 .

Kitzerow, Heinz-Siegfried, and P. P. Crooker. “Behaviour of Polymer Dispersed Cholesteric Droplets with Negative Dielectric Anisotropy in Electric Fields.”https://doi.org/10.1080/02678299208029010__Liquid Crystals 11, no. 4 (1992): 561–68.https://doi.org/10.1080/02678299208029010 .

Kitzerow, Heinz-Siegfried, F. Xu, and P. P. Crooker. “Microscopic Observations of Axial and Radial Nematic Droplets for a Dual-Frequency Addressable Liquid Crystal.”https://doi.org/10.1080/02678299208032817__Liquid Crystals 12, no. 6 (1992): 1019–24.https://doi.org/10.1080/02678299208032817 .

Heppke, G., Heinz-Siegfried Kitzerow, D. Lötzsch, and Ch. Papenfuß. “Blue Phase Mixtures Exhibiting Low Fractions of a Chiral Compound Experimental Observation of Some Unusual Properties.”https://doi.org/10.1080/02678299008047356__Liquid Crystals 8, no. 3 (1990): 407–18.https://doi.org/10.1080/02678299008047356 .

Heppke, G., B. Jéròme, Heinz-Siegfried Kitzerow, and P. Pieranski. “Observation of a Hexagonal Blue Phase in Systems with Negative Dielectric Anisotropy.”https://doi.org/10.1080/02678298908026387__Liquid Crystals 5, no. 3 (1989): 813–28.https://doi.org/10.1080/02678298908026387 .