Coto, C. et al. 2007. Effects of Dietary Levels of Calcium and Nonphytate Phosphorus in Broiler Starter Diets on Total and Water-Soluble Phosphorus Excretion as Influenced by Phytase and Addition of 25-Hydroxycholecalciferol. International Journal of Poultry Science. 6, 12 (Nov. 2007), 937–943. DOI:https://doi.org/10.3923/ijps.2007.937.943.