de León, H., E. Ramírez, G. Martínez, A. Oyervides, and A. de la Rosa. “Evaluation of Heterotic Patterns in Developing Maize Hybrids for Middle-Altitude Regions of Mexico”. Agronomía Mesoamericana, vol. 10, no. 2, July 2006, pp. 31-35, doi:10.15517/am.v10i2.17932.