For citations:

Belonovich O.A., Gutowsky S.E. Opportunistic cetacean observations in North-Western Pacific and Sea of Okhotsk in May-June 2017. The researches of the aquatic biological resources of Kamchatka and the North-West Part of the Pacific Ocean. 2017;(47):91-102. (In Russ.) https://doi.org/10.15853/2072-8212.2017.47.91-102