Mendoza Pedroza, Sergio Iban, et al. “Productive Behavior of Perennial Ryegrass Alone and Associated With Ovillo Grass and White Clover”. Revista Mexicana De Ciencias Agrícolas, vol. 9, no. 2, Apr. 2018, pp. 343-5, https://doi.org/10.29312/remexca.v9i2.1076.