Electrostriction of the cholesteric blue phases BPI and BPII in mixtures with positive dielectric anisotropy G. Heppke, B. Jérôme, H.-S. Kitzerow et P. Pieranski J. Phys. France, 50 19 (1989) 2991-2998 DOI: 10.1051/jphys:0198900500190299100