Semidey, Nelson, and Luisa E. Flores-López. “Cover Crop Rotation Influence on Nutsedge (Cyperus spp.) Density and Onion Yield”. The Journal of Agriculture of the University of Puerto Rico, vol. 90, no. 3-4, Oct. 2006, pp. 215-20, doi:10.46429/jaupr.v90i3-4.1009.