Abdurakhmanov, G. M., et al. “Biodiversity of Island Ecosystems of the Northern and Middle Caspian and a New Outlook at the Islands Age and the Caspian Sea Level Regime”. Advances in Systems Science and Applications, vol. 15, no. 4, Dec. 2015, pp. 326-37, https://ijassa.ipu.ru/index.php/ijassa/article/view/363.