Kaur Amandeep, and Gupta Usha. 2012. “Simultaneous Spectrophotometric Determination of Ponceau-S and Erythrosine in Pharmaceutical, Cosmetic and Food Samples by Using Mean Centering of Ratio Spectra Method”. International Journal of Research in Chemistry and Environment (IJRCE) 2 (3):191-98. https://ijrce.org/index.php/ijrce/article/view/361.