BACHEV, Hrabrin; IVANOV, Bodjidar; TOTEVA, Dessislava. Assessment of sustainability of agro-ecosystems in Bulgaria. Bulgarian Journal of Agricultural Science, Sofia, BG, v. 25, n. 4, p. 607–624, 2019. Disponível em: https://agriacad.eu/ojs/index.php/bjas/article/view/3947.. Acesso em: 18 oct. 2026.