Varela, Oswaldo, et al. “Evaluation of Beans (Phaseolus Vulgaris L.) in Early Generations for Resistance to Xanthomonas Campestris Pv. Phaseoli (Smith) Dye”. The Journal of Agriculture of the University of Puerto Rico, vol. 80, no. 1-2, Apr. 1996, pp. 55-63, doi:10.46429/jaupr.v80i1-2.4323.