El Amri, Zaineb, and Dalila Zaghbib-turki. “Biostratigraphic Characterisation of the Coniacian Santonian Transition in the Ellès and El Kef Sections (northern Tunisia)”. Journal of Iberian Geology, vol. 31, no. 1, Dec. 2004, pp. 99-111, https://revistas.ucm.es/index.php/JIGE/article/view/JIGE0505120099A.