Ruffell, A., and W. M. Kürschner. “Sediment Cyclicity and the Carnian Pluvial Episode: Evidence from Spectral Gamma-Ray Logging of the Mercia Mudstone Group, SW England”. Boletín Geológico Y Minero, vol. 131, no. 2, June 2020, pp. 231-42, doi:10.21701/bolgeomin.131.2.002.