N. Baker, A. Parsons, and J. Moritz, “Effects of Various Phytase Concentrations in Diets with Low-phytate Corn on Broiler Chick Performance and Nutrient Use”, Int. J. Poult. Sci., vol. 6, no. 2, pp. 77–84, Jan. 2007, doi: 10.3923/ijps.2007.77.84.