1. B. Verkin Institute for Low Temperature Physics and Engineering of the National Academy of Sciences of Ukraine; 47 Lenin Ave. Kharkov 61103 Ukraine
2. Department of Physics and Astronomy; Wayne State University; 666 West Hancock Ave. Detroit MI 48201 USA
3. Institute of Automation and Control Processes of the Far Eastern Branch of Russian Academy of Sciences; 5 Radio Street 690041 Vladivostok Russia