N, Ramesh, et al. “IN VITRO IN VIVO CORRELATION OF DEXTROMETHORPHAN HYDROBROMIDE MODIFIED RELEASE TABLETS: AN INTERNAL VALIDATION EVALUATION”. Asian Journal of Pharmaceutical and Clinical Research, vol. 8, no. 4, July 2015, pp. 79-86, https://www.journals.innovareacademics.in/index.php/ajpcr/article/view/5619.