By Alaverdyan G.   Arutyunyan A.   Vartanyan Yu.   in Astronomy Letters

ISSN:1063-7737|28|1|24-29

MAIK Nauka/Interperiodica‎(2002)‎

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By Vartanyan Yu. L.   Grigoryan A. K.   Sargsyan T. R.   in Astrophysics

ISSN:0571-7256|47|2|189-200

Springer Publishing Company ‎(2004)‎

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