E. B. A. Fonseca, E. de Oliveira, M. de Souza, and J. G. de Carvalho, “Effects of phosphorus and inoculation of VAM fungus on nutrition of two citrus rootstocks”, PAB, vol. 29, no. 12, pp. 1889–1896, Dec. 1994, doi: 10.1590/S1678-3921.pab1994.v29.4246.