Barreto, H. J., Pérez, C., Fuentes, M. R., Quelme, J. L. and Larios, L. (2016) “Effect of N-urea on corn yield under a rotation system with a leguminous covering”., Agronomía Mesoamericana, 5, pp. 88–95. doi: 10.15517/am.v5i0.25068.