Espinosa-Calderón, A., Gómez, N., Sierra, M., Betanzos, E., Caballero, F., Coutiño, B., Palafox, A., Rodríguez, F., García, A. and Cano, O. (2003) “Technology and seed production of maize hybrids and open pollinated varieties of quality protein maize (QPM) in Mexico”., Agronomía Mesoamericana, 14(2), pp. 223–228. doi: 10.15517/am.v14i2.11952.