Sotomayor-Ríos, A., J. Vélez-Fortuño, and G. Spain. “Forage Yields and Plant Character Correlations in 30 Digitaria Selections”. The Journal of Agriculture of the University of Puerto Rico, vol. 55, no. 1, Jan. 1971, pp. 53-62, doi:10.46429/jaupr.v55i1.11075.