VOSTROKNUTOV, A.V. Areas of economic activity of the population of the hillfort of Polyuty in the Inva river basin in the middle ages. Perm Federal Research Centre Journal, [S. l.], n. 4, p. 108–111, 2018. DOI: 10.7242/1998-2097/2018.4.15. Disponível em: https://journal.permsc.ru/index.php/pscj/article/view/PSCJ2018n4p15. Acesso em: 14 may. 2026.