Arche, A., Díez, J. and López Gómez, J. . (2007): “Identification of the Early Permian (Autunian) in the subsurface of the Ebro Basin, NE Spain, and its paleogeographic consequences”, Journal of Iberian Geology, 33(1), pp. 125–133. Available at: https://revistas.ucm.es/index.php/JIGE/article/view/JIGE0707120125A (Accessed: 15 October 2024).