Liu, Y., Y. L. Ma, J. M. Zhao, M. Vázquez-Añón, and H. H. Stein. 2013. Retention and digestibility of Zn, Cu, Mn, and Fe in pigs fed diets containing inorganic or organic minerals. J. Anim. Sci. 91(E-Suppl. 2):162 (Abstr.) Link to abstract