History and mythology
Pausanias, Description of Greece, *lakwnika/, chapter 19, section 11
https://www.perseus.tufts.edu/hopper/text?doc=urn:cts:greekLit:tlg0525.tlg001.perseus-grc1:3.19.11
Population and infrastructure
Site deactivated
http://vitrenko.at.ua/blog/2008-03-21-18Офіційний веб-сайт - Одеська обласна рада
http://oblrada.odessa.gov.ua/index.php?option=com_content&view=article&id=2291%3A2012-11-13-07-38-31&catid=128&Itemid=185&lang=ukUkrainian helicopter crash kills 12
http://uk.reuters.com/article/uk-ukraine-helicopter-idUKL2768884420080327
Geography
The Black Sea Encyclopedia
https://books.google.com/books?id=KFCqBAAAQBAJ&pg=PA532&lpg=PA532&dq=azov+sea+monk+seal&source=bl&ots=v-bQV5xFzh&sig=fGeY1rOideznQWJQFEazsl62XXQ&hl=en&sa=X&ved=0ahUKEwjhrdqT1pTMAhULoJQKHV2BARkQ6AEITDAK#v=onepage&q=monk%20seal%20&f=falseThe fish community in Zmiinyi Island waters: structure and determinants - Marine Biodiversity
https://doi.org/10.1007%2Fs12526-012-0109-4Digital object identifier - Wikipedia
https://en.wikipedia.org/wiki/Doi_(identifier)Marine Biodiversity
https://www.springer.com/life+sciences/ecology/journal/12526