BINO, JAMES D TERISH, et al. “SIMULTANEOUS ESTIMATION AND METHOD DEVELOPMENT FOR L-CARNITINE AND METFORMIN IN HUMAN PLASMA USING LC-MS MS”. Asian Journal of Pharmaceutical and Clinical Research, vol. 8, no. 1, Jan. 2015, pp. 185-91, https://www.journals.innovareacademics.in/index.php/ajpcr/article/view/3897.