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Sergei B. Popov, PhD. Astrophysicist. Works at the Sternberg Astronomical Institute of the Moscow State University Homepage: http://xray.sai.msu.ru/~polar/
Sergei B. Popov, PhD. Astrophysicist. Works at the Sternberg Astronomical Institute of the Moscow State University Homepage: http://xray.sai.msu.ru/~polar/