“Visual Monitoring of Dolphins in the Coastal Waters Near Zmiinyi Island (Black Sea) in 2010-2016”. Visnyk of V. N. Karazin Kharkiv National University. Series Еcоlogy, no. 16, Sept. 2017, pp. 91-95, https://doi.org/10.26565/1992-4259-2017-16-13.