00639naa#a2200193#i#450# EN\\bibl\47089 20240506184121.1 1681-1208 20030825b2003####ek#y0engy0150####ca RU The origin of black shale-hosted Mn deposits in Paratethyan basins: Constraints from geological events at the Eocene/Oligocene boundary Journal article Moscow Geophysical Center of the Russian Academy of Sciences 2003 17 с. Journal article local Varentsov I M Muzyliov N G Nikolaev V G Stupin S I rjes.ru