Arelovich, H., H. Laborde, M. Amela, M. Torrea, and M. Martínez. “Effects of Dietary Addition of Zinc and(or) Monensin on Performance, Rumen Fermentation and Digesta Kinetics in Beef Cattle”. Spanish Journal of Agricultural Research, Vol. 6, no. 3, Sept. 2008, pp. 362-7, doi:10.5424/sjar/2008063-329.