1. Wieber, M., Fetzer-Kremling, I., Reith, H., and Burschka, C., Z. Naturforsch. B, 1987, vol. 42, p. 815.
2. Tokunaga, T., Seki, H., Yasuike, S., Ikoma, M., Kurita, J., and Yamaguchi, K., Tetrahedron, 2000, vol. 56, no. 45, p. 8833.
3. Tokunaga, T., Seki, H., Yasuike, S., Ikoma, M., Kurita, J., and Yamaguchi, K., Tetrahedron Lett., 2000, vol. 41, no. 7, p. 1031.
4. Sharutin, V.V. and Sharutina, O.K., Butlerovskie soobshcheniya, 2007, vol. 12, no. 6, p. 34.
5. Thepe, T.C., Garascia, R.J., Selvoski, M.A., and Patel, A.N., Ohio J. Sci., 1977, vol. 77, no. 3, p. 134.