Hounslow , M. W., M. Hu, A. Mørk, W. Weitschat, J. Os Vigran, V. Karloukovski, and M. J. Orchard. “Intercalibration of Boreal and Tethyan Time Scales: The Magnetobiostratigraphy of the Middle Triassic and the Latest Early Triassic from Spitsbergen, Arctic Norway”. Polar Research, vol. 27, no. 3, Dec. 2008, pp. 469-90, doi:10.3402/polar.v27i3.6188.