Miyazawa, M. et al. 1992. Cobalt determination in bovine faeces by extraction with 1M HCL. Pesquisa Agropecuaria Brasileira. 27, 10 (Oct. 1992), 1415–1419. DOI:https://doi.org/10.1590/S1678-3921.pab1992.v27.3786.