SäiIä, L. K. 2011. The phylogenetic position of Nyctiphruretus acudens, a parareptile from the Permian of Russia. Journal of Iberian Geology 36, 2, 123–143. Retrieved April 25, 2024 from https://revistas.ucm.es/index.php/JIGE/article/view/JIGE1010220123A