Tuladharb, S. M., S. Amatya, and U. Ghimire. “Short Communication Isolation of Aromatic Sulphone from Plumbago Zeylanica Linn”. Biological Sciences - PJSIR, vol. 50, no. 3, June 2007, pp. 184-5, https://v2.pjsir.org/index.php/biological-sciences/article/view/868.