Chernykh VV, Chuvashov BI, Davydov VI, Schimtz M, Snyder WS. Usolka section (southern Urals, Russia): a potential candidate for GSSP to define the base of the Gzhelian Stage in the global chronostratigraphic scale . geologija [Internet]. 31. december 2006 [citirano 27. oktober 2026];49(2):205-17. Dostopno na: https://www.geologija-revija.si/index.php/geologija/article/view/1006