Isensee, P. K., S. E. Albers, L. G. Wichman, A. L. Thoma, and Y. D. Jang. “The Effect of Creep Feed and Diet Complexity on Growth Performance in Suckling and Weaned Pigs”. Revista Colombiana De Ciencias Pecuarias, vol. 33, no. 3, July 2020, pp. 159-71, doi:10.17533/udea.rccp.v33n3a04.