Jamal Ahmad Khan, M.A., and S. Syed Shafi. 2010. “Synthesis and Biological Activity of Thiazole, 4-Thiazolidine, Azetidinone Having Tetrahydrocarbazole Moiety ”. Asian Journal of Chemistry 15 (3):1443-46. https://asianpubs.org/index.php/ajchem/article/view/21825.