Jagt , J.W.M., E.A. Jagt-Yazykova, and T.D. Zonova. “Notes on Selected Cretaceous Echinoids from South-Central Sakhalin, Far East Russia”. Netherlands Journal of Geosciences (March 25, 2014): 123-132. Accessed March 27, 2026. https://njgjournal.nl/index.php/njg/article/view/12064.