SäiIä, L. K. . (2011): “The phylogenetic position of Nyctiphruretus acudens, a parareptile from the Permian of Russia”, Journal of Iberian Geology, 36(2), pp. 123–143. Available at: https://revistas.ucm.es/index.php/JIGE/article/view/JIGE1010220123A (Accessed: 4 December 2024).