Vargas JC, Benítez D, Torres V, Ríos S, Soria S. Factors determining the efficiency of milk production in systems of double purpose in Pastaza province, Ecuador. Cuban J. Agric. Sci. [Internet]. 2016 Feb. 26 [cited 2024 May 8];49(1). Available from: https://cjascience.com/index.php/CJAS/article/view/541