The first description of the double-bellied condition of the digastric muscle in the finless porpoise Neophocaena phocaenoides and Dall's porpoise Phocoenoides dalli
Ito, Haruka and Aida, Katsumi, Mammal Study, 30, 83-87 (2005), DOI:http://dx.doi.org/10.3106/1348-6160(2005)30[83:TFDOTD]2.0.CO;2