Noval, E., J. Ramón, R. García López, and J. Jiménez. “Effect of Different Doses of an Injectable Compound of Cu, Zn and Mn on Bio-Productive Indicators of Milking Cows”. Cuban Journal of Agricultural Science, vol. 50, no. 3, Dec. 2016, https://cjascience.com/index.php/CJAS/article/view/631.