Institution: | P. N. Lebedev Physical Institute, Leninsky prosp., 53, Moscow 119991, Russia;Department of Astrophysical Sciences, Princeton University, Princeton, NJ 08544, USA;Moscow Institute of Physics and Technology, Dolgoprudny 141700, Russia;LUTH, Observatory Paris-Meudon, Pl. J. Janssen 5, Meudon 92195, France |