DIMOV, Dimo; MARINOV, Ivaylo; PENEV, Toncho; MITEVA, Chonka; GERGOVSKA, Zhivka. Animal hygienic assessment of air carbon dioxide concentration in semi-open freestall barns for dairy cows. Bulgarian Journal of Agricultural Science, Sofia, BG, v. 25, n. 2, p. 354–362, 2019. Disponível em: https://agriacad.eu/ojs/index.php/bjas/article/view/4418.. Acesso em: 4 nov. 2026.