Sousa, Julio César de, et al. “Mineral Deficiency in Cattle of Roraima, Brazil. III. Calcium and Phosphorus”. Pesquisa Agropecuaria Brasileira, vol. 21, no. 12, Apr. 2014, pp. 1327-36, doi:10.1590/S1678-3921.pab1986.v21.15114.