Torres-Inga, C. S., G. E. Guevara-Viera, R. V. Guevara-Viera, L. M. Curbelo-Rodríguez, J. A. Estévez-Alfayate, Ángel E. Ceró-Rizo, M. J. Díaz y Aguirre, y J. Aguirre. Evaluation of Fattening Efficiency of Grazing Bulls through Panel Data Envelop Analysis. Revista De Producción Animal, Vol. 30, n.º 1, June 2018, pp. 21-27, https://rpa.reduc.edu.cu, rpa.reduc.edu.cu, rpa.reduc.edu.cu, rpa.reduc.edu.cu/index.php/rpa/article/view/2405.