L. F. Sobral, L. F. da S. Souza, A. F. de J. Magalhães, J. U. B. Silva, and M. de L. S. Leal, “Response of orange trees to nitrogen, phosphorus and potassium fertilization in a Yellow Latosol of the coastal plateau”, PAB, vol. 35, no. 2, pp. 307–312, Feb. 2000, doi: 10.1590/S1678-3921.pab2000.v35.5758.