COLLABORATION

Insitute of Radio Astronomy of Nat. Ac.Sci.of Ukraine (IRA), Kharkov

Sternberg State Astronomical Insitute (MSAI), Moscow

Ulugh Beg Astronomical Institute of Nat.Ac.Sci. of Uzbekistan (UBAI), Tashkent

Princeton University, U.S.A.

Astronomical Observatory of Niels Bohr Institute for Astronomy, Physics and Geophysics