Forner i Valls, Enric, et al. “Genero Berria, Stegasteridae (Echinoidea) Coniaciarreko Euskokantauriar Arroko Sakoneko Faziesekoa: New Genus of Stegasteridae (Echinoidea) from the Coniacian Deep Facies of the Basque-Cantabrian Basin”. Nemus. Revista De l’Ateneu De Natura, no. 11, July 2021, pp. 187-04, https://raco.cat/index.php/Nemus/article/view/391620.