A. S. López-González, C. A. Zúniga-González, R. A. Rangel-Cura, R. Dios-Palamares, A. P. Colón-García, and O. J. Quirós-Madrigal, “Impact of productivity and technical efficiency of basic grains in Nicaragua, 1961 - 2013”, Rev. iberoam. bioecon. cambio clim., vol. 2, no. 1, pp. 411–436, Jan. 2016.