00645naa#a2200181#i#450# EN\\bibl\46994 20241002132752.3 1681-1208 20070425b2007####ek#y0engy0150####ca RU Strontium isotope stratigraphy: Possible applications for age estimation and global correlation of Late Permian carbonates of the Pechishchi type section, Volga River Journal article Moscow Geophysical Center of the Russian Academy of Sciences 2007 7 с. Journal article local Nurgalieva N G Ponomarchuk V A Nurgaliev D K rjes.ru