Kunkuma, Vijayalakshmi, Lakshmi Anu Prabhavathi Devi Bethala, Yadagiri Bhongiri, Badari Narayana Prasad Rachapudi, and Seetharamanjaneya Sai Prasad Potharaju. 2011. “An Efficient Synthesis of Quinoxalines Catalyzed by Monoammonium Salt of 12-Tungstophosphoric Acid”. European Journal of Chemistry 2 (4):495-98. https://doi.org/10.5155/eurjchem.2.4.495-498.413.