Mayoral, E. J., and R.H. Wagner. “The Early Permian of Valdeviar in Sevilla Province, SW Spain: Basin History and climatic/Palaeogeographic Implications”. Journal of Iberian Geology 33, no. 1 (January 1, 2007): 93–124. Accessed November 21, 2024. https://revistas.ucm.es/index.php/JIGE/article/view/JIGE0707120093A.