By Minkovska V.   Peybernès B.   Nikolov T.   in Cretaceous Research

ISSN:0195-6671|23|1|37-48

Academic Press‎(2002)‎

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By Mladenov G.   Vassileva V.   Vutova K.   Nikolov T.   in Vacuum

ISSN:0042-207X|47|6|825-828

Elsevier‎(1996)‎

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