1. Hartgerink, J.W., van der Laan, L.C.J., Engberts, J.B.F.N., De Boer, Th.J.: Tetrahedron 27 (1971) 4323.
2. Zorin, V.V., Zlot’skii, S.S., Ilyasov, A.V., Rakhmankulov, D.L.: Bull. Acad. Sci. USSR (English Transl.) 25 (1976) 1965.
3. Adeleke, B.A., Wong, S.-K., Wan, J.K.S.: Can. J. Chem. 52 (1974) 2901.
4. Leaver, I.H., Ramsay, G.C.: Tetrahedron 25 (1969) 5669.
5. Gasanov, R.G., Petrova, R.G., Freidlina, R.Kh.: Doklady Chem. (English Transl.) 227 (1976) 264.