Verma, R. K., P. C. Verma, R. P. Gupta, and D. N. Bhargava. “Effect of Experimental Phosphorus Deficiency on Protein and Feed Efficiency Ratios in Rats”. The Indian Journal of Nutrition and Dietetics, vol. 27, no. 6, June 1990, pp. 190-4, http://www.informaticsjournals.com/index.php/ijnd/article/view/7823.