Nakrem , Hans Arne, Michael J. Orchard, Wolfgang Weitschat, Mark W. Hounslow, Tyler W. Beatty, and Atle Mørk. 2008. “Triassic Conodonts from Svalbard and Their Boreal Correlations”. Polar Research 27 (3):523-39. https://doi.org/10.3402/polar.v27i3.6190.