1. Institute of Physics NASU, Prospect Nauky 46, Kyiv 03039, Ukraine.
2. Liquid Crystal Institute, Kent State University, Kent, OH 44242, USA.
3. National Technical University of Ukraine “KPI,” Prospect Peremogy 37, Kyiv 03056, Ukraine.
4. Bogolyubov Institute for Theoretical Physics NASU, 14-b Metrolohichna Street, Kyiv 03680, Ukraine.
5. Liquid Crystals Division, Merck KGaA, 64271 Darmstadt, Germany.