- S2CID 129376371. Keller, B.M.; Fedonkin, M.A. (1976). "New
records of
fossils in the
Valdaian group of the
precambrian on the Syuz'ma River" (PDF).
Izvestiya Akademii...
- S2CID 203853224.
Keller BM,
Fedonkin MA (1976). "New
Records of
Fossils in the
Valdaian Group of the
Precambrian on the Syuz'ma River" (PDF).
Izvestiya Akademii...
- x. Keller, B.M.; Fedonkin, M.A. (1976). "New
records of
fossils in the
Valdaian group of the
precambrian on the Syuz'ma River" (PDF).
Izvestiya Akademii...
- валдайской серии докембрия по р. Сюзьме [New
Records of
Fossils in the
Valdaian Group of the
Precambrian on the Syuz'ma River] (PDF). Izv. Akad. Nauk SSSR...
- Keller, B. M.; Fedonkin, M. A. (1976). "New
Records of
Fossils in the
Valdaian Group of the
Precambrian on the Syuz'ma River" (PDF).
Izvestiya Akademii...
- later). Keller, B.M.; Fedonkin, M.A. (1976). "New
Records of
Fossils in the
Valdaian Group of the
Precambrian on the Syuz'ma River" (PDF).
Izvestiya Akademii...
- 118. Keller, B.M.; Fedonkin, M.A. (1976). "New
records of
fossils in the
Valdaian group of the
precambrian on the Syuz'ma River" (PDF).
Izvestiya Akademii...
