Sato, Tokiyuki, Takato Saito, Shiho Yuguchi, Hiroshi Nakagawa, Koji Kameo, and Toshiaki Takayama. “Late Pliocene Calcareous Nannofossil Paleobiogeography of the Pacific Ocean: Evidence for Glaciation at 2.75 Ma”. Revista Mexicana de Ciencias Geológicas 19, no. 3 (June 15, 2018): 175–189. Accessed April 16, 2025. https://rmcg.geociencias.unam.mx/index.php/rmcg/article/view/964.