Schudack, U. and M. Schudack. “Ostracod biostratigraphy in the Lower Cretaceous of the Iberian chain (eastern Spain)”. Journal of Iberian Geology, vol. 35, vol. 35, no. 2, 2009, pp. 141-68, https://revistas.ucm.es/index.php/JIGE/article/view/JIGE0909220141A.