Prashant L, P., and R. R.P. “EFFECT OF PIPER NIGRUM ON IN-VITRO RELEASE OF RIFAMPICIN MICROSPHERES”. Asian Journal of Pharmaceutical and Clinical Research, vol. 6, no. 9, Nov. 2013, pp. 79-83, https://journals.innovareacademics.in/index.php/ajpcr/article/view/556.