Authors Year Title
Yolkin, Bakharev & Alekseenko 2000 Emsian (Lower Devonian) ammonoids and tentaculites from the Kuvash reference section from the Gornyi Altai (southern West Siberia)
Novosti paleontologii i stratigrafii, Prilozhenie k zhurnalu "Geologiya i Geofizika", 2-3, pp. 189-193, Novosibirsk.