Ahmed, A. S., M. B. Bhatty, M. T. Saeed, and M. P. I. Qazi. 2005. “Eparation of Close Boiling Acidic Isomers by Dissociation Extraction”. Biological Sciences - PJSIR 48 (4):240-46. https://v2.pjsir.org/index.php/biological-sciences/article/view/1385.