Plasencia, P., A. Márquez- Aliaga, and F. Hirsch. “Sephardiellinae, a new Middle Triassic conodont subfamily”. Journal of Iberian Geology, vol. 33, vol. 33, no. 2, 2007, pp. 163-72, https://revistas.ucm.es/index.php/JIGE/article/view/JIGE0707210163A.