Prof. Dr. Andrey V. Solov'yov
Department of Physics, Goethe University
Ruth-Moufang-Str. 1
60438 Frankfurt am Main, Germany
E-mail: solovyov@th.physik.uni-frankfurt.de
Asst. Prof. Dr. Ilia A. Solov’yov
Department of Physics, Chemistry and Pharmacy,
University of Southern Denmark
Campusvej 55
5230 Odense M, Denmark
E-mail: ilia@sdu.sk
Prof. Dr. Nigel J. Mason
Department of Physics and Astronomy,
The Open University
MK7 6AA, Milton Keynes,
United Kingdom