. . . . . . . . . . . . . . . . . . . . . . . . . . "1934" . . . "1863" . "Sergey Fedorovich Oldenburg" . . . . . . . . . . . "S. F. Oldenburg" . . . . . . . "Sergey Oldenburg" . . "Sergey Oldenburg" . . . . . . "Sergei" . . "Sergey Fyodorovich Oldenburg" . . .