CHEKIN, Leonid S. A Russian discovery in the Arctic ocean at the time of Columbus. Nordlit, Tromsø, Norway, n. 39, p. 58–74, 2017. DOI: 10.7557/13.4203. Disponível em: https://septentrio.uit.no/index.php/nordlit/article/view/4203. Acesso em: 14 jun. 2026.