Observation of a hexagonal blue phase in systems with negative dielectric anisotropy
G. Heppke, B. Jéròme, H.-S. Kitzerow, P. Pieranski, Liquid Crystals 5 (1989) 813–828.

Electrostriction of the cholesteric blue phases BPI and BPII in mixtures with positive dielectric anisotropy
G. Heppke, B. Jérôme, H.-S. Kitzerow, P. Pieranski, Journal de Physique 50 (1989) 2991–2998.

Electrostriction of BPI and BPII for blue phase systems with negative dielectric anisotropy
G. Heppke, B. Jérôme, H.-S. Kitzerow, P. Pieranski, Journal de Physique 50 (1989) 549–562.

Magnetic-field-induced orientation of crystallites in powders of layered intercalation compounds detected by NMR
T.K. Halstead, C. Schmidt, H.W. Spiess, R. Schoellhorn, W. Mueller-Warmuth, H. Moeller, The Journal of Physical Chemistry 92 (1988) 7167–7168.

Deuteron two-dimensional exchange NMR in solids
C. Schmidt, B. Blümich, H.W. Spiess, Journal of Magnetic Resonance (1969) 79 (1988) 269–290.

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

Electrooptic Effect in a Non-Polar Nematic Discotic Liquid Crystal
G. Heppke, H.-S. Kitzerow, F. Oestreicher, S. Quentel, A. Ranft, Molecular Crystals and Liquid Crystals Letters 6 (1988) 71–79.

Molecular motions from two-dimensional NMR of powders: Comparison of rotational jumps and diffusive reorientations
C. Schmidt, B. Blümich, S. Wefing, S. Kaufmann, H.W. Spiess, Berichte Der Bunsengesellschaft Für Physikalische Chemie 91 (1987) 1141–1145.

Angular Dependence of Blue Phase Selective Reflection in the Electric Field
G. Heppke, H.-S. Kitzerow, M. Krumrey, Molecular Crystals and Liquid Crystals Incorporating Nonlinear Optics 150 (1987) 265–276.

Dynamics of molecular reorientations: direct determination of rotational angles from two-dimensional NMR of powders
C. Schmidt, S. Wefing, B. Blümich, H.W. Spiess, Chemical Physics Letters 130 (1986) 84–90.