K. Hakobyan, L. Karapetyan, and L. Aristakesyan, “SYNTHESIS OF 3-FUNCTIONALLY SUBSTITUTED-4,5-DIPHENYL-Δ$^3$-BUTENOLIDES”, Proc. YSU B: Chem. Biol. Sci., vol. 45, no. 3 (226), pp. 26–29, Nov. 2011.