B. D.  Rupanwar, Chavan, S. S., Shelke, A. M., and Suryavanshi, G. M., ?Triflic acid-catalyzed metal-free synthesis of (E)-2-cyanoacrylamides and 3-substituted azetidine-2,4-diones?, New Journal of Chemistry, vol. 42, no. 8, pp. 6433-6440, 2018.