Samuels, George, and A. Vélez-Ramos. “Field Experiments With Polaris As a Chemical Ripener of Sugarcane in Puerto Rico, 1971-72”. The Journal of Agriculture of the University of Puerto Rico, vol. 61, no. 2, Apr. 1977, pp. 242-9, doi:10.46429/jaupr.v61i2.10465.