V.  Nair, Vidya, N., Biju, A. T., Deepthi, A. B., Abhilash, K. G., and Eringathodi, S., ?DMAP-catalyzed reaction of beta-ketoesters and dimethyl acetylenedicarboxylate: an efficient synthesis of polysubstituted benzenes and biaryls?, Tetrahedron, vol. 62, no. 43, pp. 10136?10140, 2006.