I. N. Sirekanyan, H. N. Engibaryan, H. G. Khachatryan, and M. L. . Yeritsyan, “UNSATURATED REACTIONABLE DERIVATIVES OF BIURET”, Proc. YSU B: Chem. Biol. Sci., vol. 43, no. 2 (219), pp. 27–31, May 2009.