Ponnuvel, P., et al. “Effect Of Phytase Enzyme Supplementation In Low Energy And Low Protein Diets On The Production Performance Of Layer Chicken ”. Indian Journal of Veterinary Sciences and Biotechnology, vol. 9, no. 4, Mar. 2014, pp. 39-42, https://acspublisher.com/journals/index.php/ijvsbt/article/view/3038.