1
by Velkov, Asparukh
Sofii͡a : Akademichno izd. "Prof. Marin Drinov", 2002
Sofii͡a : Akademichno izd. "Prof. Marin Drinov", 2002
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Book
2
by Todorov, Nikolaĭ
Sofia : Editions de l'Académie bulgare des sciences, 1988
Other Authors:
“...Velkov, Asparukh...”Sofia : Editions de l'Académie bulgare des sciences, 1988
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Book
3