Kumar, Vipin, et al. “3D QSAR STUDIES ON PYRROLOPYRIMIDINES AS SELECTIVE P-GLYCOPROTEIN ANTAGONIST”. International Journal of Pharmacy and Pharmaceutical Sciences, vol. 6, no. 8, Aug. 2014, pp. 232-9, https://www.journals.innovareacademics.in/index.php/ijpps/article/view/2769.