MISHRA, P. .; YADAV, K. S. .; GAUTAM, G. . Standardization of roots of Calotropisprocera and Calotropis gigantean via evaluation of morphological and physicochemical parameters. International Journal of Research and Development in Pharmacy & Life Sciences, v. 6, n. 4, p. 2706 - 2710, 15 Jul. 2017.