1. Center for Evaluation of Activity of Research Institutions and Scientific Support of Regional Development of Ukraine, NAS of Ukraine, 54 Volodymyrska Str., 01601 Kyiv, Ukraine
2. Wolfgang Pauli Institute, Oskar-Morgenstern-Platz 1, A-1090 Vienna, Austria and Institute of Mathematics of NAS of Ukraine, 3 Tereshchenkivska Str., 01004 Kyiv, Ukraine