00632naa#a2200205#i#450# EN\\bibl\47126 20240901080830.7 1681-1208 19991225b1999####ek#y0engy0150####ca RU K-Ar geochronology of new volcanic centers eruptions in the Kazbek region of the Great Caucasus Journal article Moscow Geophysical Center of the Russian Academy of Sciences 1999 7 с. Journal article local Chernyshev I V Arakelyants M M Lebedev V A Bubnov S N Gol'tsman Yu V rjes.ru