Mitta, V. V., and Yu. I. Bogomolov. “Late Jurassic of the Russian Platform: Ammonite Evolution and Paleoenvironments”. Bulletin of the Geological Society of Greece 40, no. 3 (January 1, 2007): 1485–1490. Accessed November 24, 2024. https://ejournals.epublishing.ekt.gr/index.php/geosociety/article/view/16991.