Khan, M. A., & Lucia, V. (2000). ?TETRA CYCLIC HETEROAROMATIC SYSTEMS. PART-II. BENZIMIDAZO [1, 2-a] BENZIMIDAZOLES. Biological Sciences - PJSIR, 43(3), 168–70. Retrieved from https://v2.pjsir.org/index.php/biological-sciences/article/view/2022