BACHEV, H. I. Study on sustainability of Bulgarian agro-ecosystems. Journal of Economics Library, [S. l.], v. 6, n. 2, p. 118–154, 2019. DOI: 10.1453/jel.v6i2.1869. Disponível em: https://journals.econsciences.com/index.php/JEL/article/view/1869. Acesso em: 4 jul. 2024.