Chlebowski , Roman, and Andrzej Wierzbowski. “Pyroclastic Material from the Upper Triassic Deposits of Sassenfjorden, Spitsbergen”. Polar Research 1, no. 1 (January 1, 2010): 75-81. Accessed April 4, 2026. https://polarresearch.net/index.php/polar/article/view/2546.