Román, F. M., A. Beale, and H. Irizarry. “Intercropping to Control Weeds in Yam (Dioscorea Rotundata) and Sweet Potato (Ipomoea Batatas)”. The Journal of Agriculture of the University of Puerto Rico, vol. 75, no. 1, Jan. 1991, pp. 11-18, doi:10.46429/jaupr.v75i1.3543.