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Pensoft Publishers
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Sofia ; Moscow : Pensoft Publishers, 2008.
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[Place of publication not identified] : Pensoft Publishers, 2009.
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Sofia : Pensoft Publishers, 2006.
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Buffagni, Andrea.
Sofia : Pensoft Publishers, 2009.
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Sofia, Bulgaria : PENSOFT Publishers, 2006.
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Alekseev, A. N. (Andreĭ Nikolaevich)
Sofia : Pensoft Publishers, 2010.
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Sysoev, A. V.
Sofia, Bulgaria : Pensoft Publishers, 2009.
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Heller, Joseph, 1941-
Sofia, Bulgary ; Moscow : Pensoft Publishers, 2009.
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Berman, D. I.
Bulgaria : Pensoft Publishers, 2010.
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Klimaszewski, J.
Sofia : Pensoft Publishers, 2010.
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Konstantinov, Alexander S., 1955-
Sofia : Pensoft Publishers, 2011.
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Bellamy, C. L.
Sofia : Pensoft Publishers, 2008.
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Bellamy, C. L.
Sofia : Pensoft Publishers, 2008.
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Bellamy, C. L.
Sofia : Pensoft Publishers, 2008.
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Bellamy, C. L.
Sofia : Pensoft Publishers, 2009.
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