MARINOW, Kirił. The Environment and Geopolitics of the State. In: LESZKA, Mirosław J. (ed.). The Bulgarian State in 927-969. The Epoch of Tsar Peter I: No. XXXIV. Byzantina LodziensiaPoland: Lodz University Press,2018. p. 173–201. DOI: 10.18778/8142-115-7.11. Disponível em: https://www.press.uni.lodz.pl/index.php/wul/catalog/book/1057/chapter/2731. Acesso em: 15 feb. 2026.