Simultaneous Quantification of Lupeol, Stigmasterol and ?- Sitosterol in Extracts of Adhatoda vasica Nees Leaves and its Marketed Formulations by a Validated RP-HPLC Method, S, Nandhini, and K Ilango , Pharmacognosy Journal, June 2020, Volume 12, Issue 4, p.850-856, (2020)