Baker, N.J., et al. “Effects of Various Phytase Concentrations in Diets With Low-Phytate Corn on Broiler Chick Performance and Nutrient Use”. International Journal of Poultry Science, vol. 6, no. 2, Jan. 2007, pp. 77–84, https://doi.org/10.3923/ijps.2007.77.84.