SANDHYA, S. M., et al. “APPLICATION OF ION PAIR EXTRACTIVE SPECTROPHOTOMETRIC METHODS FOR THE DETERMINATION OF GABAPENTIN IN PHARMACEUTICAL FORMULATION”. Asian Journal of Pharmaceutical and Clinical Research, vol. 7, no. 6, Feb. 2014, pp. 57-58, https://www.journals.innovareacademics.in/index.php/ajpcr/article/view/794.