Baksheeva , Svetlana E. “FIRST SCHEMES OF THE MEDIEVAL MONGOLIAN HILLFORTS OF TRANSBAIKALIA ACCORDING TO UNPUBLISHED SOURCES: P. K. FROLOV (1775-1839)”. Arkheologiia Evraziiskikh Stepei (Archaeology of the Eurasian Steppes), no. 4 (August 31, 2021): 96–109. Accessed July 3, 2024. https://evrazstep.ru/index.php/aes/article/view/571.