Elucidation of ?-sitosterol from Benincasa hispida Seeds, Carissa congesta Roots and Polyalthia longifolia Leaves by High Performance Thin Layer Chromatography, Doshi, Gaurav Mahesh, Chaskar Pratip Kashinath, and Une Hemant Devidas , Pharmacognosy Journal, Jul-Aug 2015, Volume 7, Issue 4, p.221-227, (2015)