MIKOVA, Rositza. Agro-Ecological Conditions and Regional Features in the Production of Wheat and Sunflower. Bulgarian Journal of Agricultural Economics and Management, Sofia, BG, v. 65, n. 4, p. 50–57, 2020. Disponível em: https://agriacad.eu/ojs/index.php/bjaem/article/view/2451.. Acesso em: 3 nov. 2026.