Affiliation: | (1) Department of Theoretical Physics , NPI, Academy of Sciences, CZ-25068 Řež, Czech Republic;(2) Doppler Institute, Czech Technical University, Břehová 7, CZ-11519 Prague, Czech Republic;(3) Department of Mathematics, Faculty of Science, Kanazawa University, Kanazawa 920-1192, Japan;(4) WIAS Berlin, Mohrenstr. 39, D-10117 Berlin, Germany;(5) Départment de Physique, Université de la Méditerranée (Aix-Marseille II), F-13288 Marseille Cedex 9, France;(6) Centre de Physique Théorique Luminy, Case 907, F-13288 Marseille Cedex 9, France |