D’ARPA, CAROLINA, and GUILLERMO MELÉNDEZ. 2004. “OXFORDIAN BIOSTRATIGRAPHY AND AMMONITE ASSOCIATIONS FROM WEST SICILY: BIOSTRATIGRAPHIC SUCCESSION OF GENUS <em>GREGORYCERAS</Em> AND CORRELATION WITH TETHYAN PERISPHINCTID SCALE”. RIVISTA ITALIANA DI PALEONTOLOGIA E STRATIGRAFIA 110 (1). https://doi.org/10.13130/2039-4942/6296.