Marinow K. Wild, Haughty and Menacing Highlanders: Bulgarians and Mountains in the Context of Byzantine-Bulgarian Armed Conflicts. In: Leszka MJ, ed. The Bulgarian State in 927-969. The Epoch of Tsar Peter I: No. XXXIV. Byzantina Lodziensia. Lodz University Press; 2018:287-301. doi:10.18778/8142-115-7.16