Author V. Novotná, J. Žurek, V. Kozmík, J. Svoboda, M. Glogarová, J. Kroupa, D. Pociecha Laboratory / Department Department of Dielectrics DOI 10.1080/02678290802364012 Postscript Liquid Crystals 35 (2008) 1023-1036. Date 2008