T. V. Matviiuk, M. V. Gorichko, C. Lherbet, M. Baltas, and Z. V. Voitenko, “Carbon-carbon and carbon-heteroatom conjugate addition of n-substituted maleimides to 4h-1,2,4- triazol-3-thioles, 2-amino-1,3-thiazoles, 1h-imidazole and 2-phenylindolizine catalyzed by lewis acids”, J. Org. Pharm. Chem., vol. 11, no. 3(43), pp. 36–42, Sep. 2013.