POPOVA, T. P.; BAYKOV, B. D.; KIROV, V. K. Testing the effect of different concentrations of formalin for decontamination of cattle manure. Bulgarian Journal of Agricultural Science, Sofia, BG, v. 19, n. 6, p. 1283–1286, 2013. Disponível em: https://agriacad.eu/ojs/index.php/bjas/article/view/6165.. Acesso em: 12 nov. 2026.