1. Zaugg, H.E. and Martin, W.B., Organic Reactions, Cope, A.C., Ed., New York: Wiley, 1965, vol. 14. Translated under the title Organicheskie reaktsii, Moscow: Inostrannaya Literatura, 1967, vol. 14, p. 65.
2. Gilbert, E.E., Synthesis, 1972, p. 30.
3. Fernandez, A.H., Alvarez, R.M., and Abajo, T.M., Synthesis, 1996, p. 1299.
4. Krist’yanson, P.G., Arro, Z.V., and Suurpere, A.O., Tr. Tallin. Tekhn. Univ., 1990, no. 719, p. 28; Ref. Zh., Khim., 1991, no. 18Zh78.
5. Orazi, O.O. and Corral, R.A., J. Chem. Soc., Perkin Trans. 1, 1975, p. 772.