Gubaidullin , A. M., & Belyaev , A. V. (2024). About the Early Defensive Line of the Bolgar Settlement. Arkheologiia Evraziiskikh Stepei (Archaeology of the Eurasian Steppes), (5), 287–296. https://doi.org/10.24852/2587-6112.2024.5.287.296