Mart?nez-Melo, J., V. Torres, N. Hern?ndez, and H. Jord?. “Impact Index for the Characterization of Factors Affecting Milk Production in Farms of Ciego De ?Vila Province, Cuba”. Cuban Journal of Agricultural Science, vol. 47, no. 4, Dec. 2013, https://cjascience.com/index.php/CJAS/article/view/383.