Riccardo Manni, Letizia Di Bella, Ruggero Matteucci,. “Echinoid Grazing Traces on Ostreid Shell-Ground from the Pliocene Ficulle Quarry (central Italy)”. Journal of Mediterranean Earth Sciences 4 (November 25, 2014). Accessed November 25, 2024. https://rosa.uniroma1.it/rosa04/mediterranean_earth_sciences/article/view/16231.