Ivanova, M. and Zhurbin, I. (2017) “FORTIFIED SETTLEMENTS OF THE BASIN OF THE RIVER CHEPTSA: FEATURES OF THE DEVELOPMENT AND USE OF THE SITES”, Perm Federal Research Centre Journal, (3), pp. 56–62. Available at: https://journal-dev.icmm.ru/index.php/pscj/article/view/PSCJ2016n3p9 (Accessed: 13 May 2026).