Institution: | Department of Applied Mathematics, The University of Leeds, Leeds LS2 9GT;Space Research Institute, 84/32 Profsoyuznaya Street, Moscow 117997, Russia;Section of Astrophysics, Astronomy and Mechanics, Physics Department, University of Athens, 15784 Zografos, Athens, Greece;Department of Astronomy and Astrophysics and Enrico Fermi Institute, University of Chicago, 5640 South Ellis Avenue, Chicago, IL 60637, USA |