Paulino-Paulino, J., E. W. Harmsen, D. Sotomayor-Ramírez, and L. E. Rivera. “Nitrate Leaching under Different Levels of Irrigation for Three Turfgrasses in Southern Puerto Rico”. The Journal of Agriculture of the University of Puerto Rico, vol. 92, no. 3-4, Oct. 2008, pp. 135-52, doi:10.46429/jaupr.v92i3-4.2632.