Coto, C., Yan, F., Cerrate, S., Wang, Z., Sacakli, P., & Waldroup, P. (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), 937–943. https://doi.org/10.3923/ijps.2007.937.943