Project 798: M. Murakami, C. Shimada, Y. Hikida, H. Hirano. 2012. Two new extinct basal phocoenids (Cetacea, Odontoceti, Delphinoidea), from the upper Miocene Koetoi Formation of Japan and their phylogenetic significance. Journal of Vertebrate Paleontology. 32 (5):1172-1185.