T. M.  Potewar, Ingale, S. A., and Srinivasan, K. V., ?Efficient synthesis of quinoxalines in the ionic liquid 1-n-butylimidazolium tetrafluoroborate ([Hbim]BF4) at ambient temperature?, Synthetic Communications, vol. 38, no. 21, pp. 3601-3612, 2008.