1. Claisen, L. and Tietze, E., Ber., 1925, vol. 58, p. 275.
2. Sanchez, A.M., Veglia, A.V., and de Rossi, R.H., Can. J. Chem., 1997, vol. 75, p. 1151.
3. Pogrebnoi, S.I., Kal’yan, Yu.B., Krimer, M.Z., and Smit, V.A., Russ. Chem. Bull., 1991, no. 4, p. 733.
4. Smit, V.A., Pogrebnoi, S.I., Kal’yan, Yu.B., and Krimer, M.Z., Russ. Chem. Bull., 1990, no. 8, p. 1760.
5. Katkevica, S., Zicmanis, A., and Mekss, P., Chem. Heterocycl. Comp., 2010, vol. 46, p. 158.