Verma, R. K., P. C. Verma, R. P. Gupta, and D. N. Bhargava. 1990. “Effect of Experimental Phosphorus Deficiency on Protein and Feed Efficiency Ratios in Rats”. The Indian Journal of Nutrition and Dietetics 27 (6):190-94. http://www.informaticsjournals.com/index.php/ijnd/article/view/7823.