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1
by Velkov, Asparukh.
Published 2002

Book
2
Published 1961

Government Document Book
4
Published 2007

Book
5
Published 1968

Conference Proceeding Book
7
by Kostova, Emilii͡a.
Published 1981

Book
8
by Komandarev, Stamat.
Published 1990

Book
9
by Eskenazi, Zhak.
Published 2002

Book
10
Published 1976

Book
12
by Duridanov, Ivan.
Published 1980

Book
13
14
by Balevska, Elka.
Published 1973

Book
16
Published 2004

Book
18
Published 1968

Book