Loseva, Anna, Sergey Kouzov, and Rustam Sagitov. “The Discovery of the Baltic Ringed Seal (<em>Pusa Hispida botnica</Em&gt;) Breeding Lair in Kurgalskii Reserve”. Biological Communications0, no. 4 (November 17, 2014): 4–9. Accessed October 27, 2020. https://biocomm.spbu.ru/article/view/1057.