Weitschat W. Intraspecific variation of Svalbardiceras spitzbergensis (Frebold) from the Early Triassic (Spathian) of Spitsbergen. polar [Internet]. 2008Dec.1 [cited 2026Mar.27];27(3):292-7. Available from: https://polarresearch.net/index.php/polar/article/view/2891