F. Cervantes-Ortíz, J. Covarrubias-Prieto, J. A. Rangel-Lucio, A. D. Terrón-Ibarra, M. Mendoza-Elos, and R. E. Preciado-Ortiz, “Population density and application of nitrogen in the production of hybrid corn seed”., Agron. Mesoam., vol. 24, no. 1, pp. 101–110, May 2013.