Nakamura Koji, Kimura Gaku, and Winsnes Thore S. “Brachiopod Zonation and Age of the Permian Kapp Starostin Formation (central Spitsbergen)”. Polar Research 5, no. 2 (January 12, 1987): 207-219. Accessed July 23, 2024. https://polarresearch.net/index.php/polar/article/view/2449.