Durand, M., F. Fluteau, S. Bourquin, J. Broutin, and J.B. Díez. 2007. “The Permian-Triassic boundary and Early Triassic sedimentation in Western European basins: an overview”. Journal of Iberian Geology 33, nº 2:: 221-36. https://revistas.ucm.es/index.php/JIGE/article/view/JIGE0707210221A