Institution: | 1.St. Petersburg State University,St. Petersburg,Russia;2.University of Latvia, Institute of Atomic Physics and Spectroscopy,Riga,Latvia;3.University ITMO,St. Petersburg,Russia;4.Astronomical Observatory,Belgrade 74,Serbia;5.Observatoire de Paris,Meudon Cedex,France;6.IHIS Techno Experts,Zemun,Serbia;7.Institute of Physics,University of Belgrade,Belgrade,Serbia |