Vaneet Dhir, and R. P. Singh Grewal. 2016. “Comparative Physiochemical Analysis Of Phenylalanine, Tryp-Tophan & Methionine in Aqueous Solutions Of Nitrates In Terms of Linear, Exponential, Second Order Polynomial and Third Order Polynomial Using Volumetric Approach”. International Journal of Pharmaceutics and Drug Analysis 4 (4):172-82. https://www.ijpda.org/index.php/journal/article/view/213.