R. Sreenivasa Rao, Shajan, F. Joseph, and D. Reddy, S., ?Route to access imidazol[1,5-a]indole-1,3-diones and pyrrolo[1,2-c]imidazole-1,3-diones?, Organic & Biomolecular Chemistry, vol. 17, no. 36, pp. 8384-8390, 2019.