A. KORETSKY, IRINA, and SULMAN J. RAHMAT. 2013. “FIRST RECORD OF FOSSIL CYSTOPHORINAE (CARNIVORA, PHOCIDAE): MIDDLE MIOCENE SEALS FROM THE NORTHERN PARATETHYS”. RIVISTA ITALIANA DI PALEONTOLOGIA E STRATIGRAFIA 119 (3). https://doi.org/10.13130/2039-4942/6043.