Affiliation: | (1) Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, Massachusetts, 02138, U.S.A.;(2) Institute of Continuous Media Mechanics, Korolyov str. 1, 614061 Perm, Russia;(3) Mathematics Department, Manchester University, Manchester, M13 9PL, U.K.;(4) Department of Physics, Moscow State University, Moscow, 119992, Russia |