Tucci, Fernanda Marcussi, et al. “Trofic Agents in the Diet of Weaned Pigs on the Activity of the Digestive Enzymes and the Performance”. Brazilian Journal of Veterinary Research and Animal Science, vol. 48, no. 4, Aug. 2011, pp. 289-98, https://doi.org/10.11606/S1413-95962011000400003.