BENATOV Saumuil
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MOTCHUROVA-DEKOVA Neda
Department of Geology and Palaeontology
University of Mining and Geology
Studentski grad
1756 Sofia
Bulgarie
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STOYANOVA Rossitza
Dept of Organic Chemistry
University of Chemical Technology & Metallurgy
Sofia 1756
Bulgarie
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TCHOUMATCHENCO Platon V.
Institut de Géologie
Academie Bulgare des Sciences
Rue Acad. G. Boncev Bl. 24
1113 Sofia
Bulgarie
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