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Ichishima, H.; Kimura, M. (2000). „A new fossil porpoise (Cetacea; Delphinoidea; Phocoenidae) from the Early Pliocene Horokaoshirarika Formation, Hokkaido, Japan”. Journal of Vertebrate Paleontology. 20 (3): 561—576. JSTOR4524127. doi:10.1671/0272-4634(2000)020[0561:ANFPCD]2.0.CO;2.
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ncbi.nlm.nih.gov
McGowen, M.R.; Tsagkogeorga, G.; Alvarez-Carretero, G.; et al. (2020). „Phylogenomic Resolution of the Cetacean Tree of Life Using Target Sequence Capture”. Syst Biol. 69 (3): 479—501. PMID31633766. doi:10.1093/sysbio/syz068.
Reidenberg, Joy (2007). „Anatomical adaptations of aquatic mammals”. The Anatomical Record. 290 (6): 507—513. PMID17516440. doi:10.1002/ar.20541.