By Balega I.   Balega Yu.   Malogolovets E.   in Astrophysical Bulletin

ISSN:1990-3413|65|3|250-255

MAIK Nauka/Interperiodica‎(2010)‎

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By Balega I.   Balega Yu.   Hofmann K.-   Weigelt G.   in Astronomy Letters

ISSN:1063-7737|27|2|95-98

MAIK Nauka/Interperiodica‎(2001)‎

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