C. Virgili, “The Permian-Triassic transition: Historical review of the most important ecological crises with special emphasis on the Iberian Peninsula and Western-Central Europe”, JIGE, vol. 34, no. 1, pp. 123–158, Jan. 2008, Accessed: Nov. 14, 2024. Available: https://revistas.ucm.es/index.php/JIGE/article/view/JIGE0808120123A