Alexander, A. G., R. Montalvo-Zapata, and A. Kumar. “Enzyme-Silicon Studies of Gibberellic Acid-Treated Sugarcane During the Post Growth-Stimulatory Phase”. The Journal of Agriculture of the University of Puerto Rico, vol. 54, no. 1, Jan. 1970, pp. 82-95, doi:10.46429/jaupr.v54i1.11115.