Institution: | Institute of Theoretical Physics, University of Bia?ystok, Lipowa 41, 15-424 Bia?ystok, Poland;Copernicus Astronomical Centre, Bartycka 18, 00-716 Warsaw, Poland;Department of Physics, University of Durham, South Road, Durham DH1 3LE;Obserwatorium Astronomiczne Uniwersytetu Jagiellońskiego, 30-244 Kraków, Orla 171, Poland |