C. H. Tokarnia, C. F. C. Canella, J. A. Guimarães, J. Döbereiner, and J. Langenegger, “Phosphorus deficiency in cattle in Piauí, Brazil”, PAB, vol. 5, no. 1, pp. 483–494, Apr. 2014, doi: 10.1590/S1678-3921.pab1970.v5.17870.