Pérez-López, Agripino, and Rubén D. Reyes-Jurado. “Effect of Nitrogen and Boron Application on Carica Papaya L. I. Growth and Yield”. The Journal of Agriculture of the University of Puerto Rico, vol. 67, no. 3, July 1983, pp. 181-7, doi:10.46429/jaupr.v67i3.7711.