1. Teeninga, H., Engberts, J.B.F.N.: Tetrahedron Lett. 1982, 1007.
2. Baas, P., Cerfontain, H.: Tetrahedron 35 (1979) 1135.
3. Perkins, M.J.: Radicaux Libres Organiques, Coll. Int. (CNRS, No. 278, Paris) 1978, 137.
4. Hvang, O.I., Belevskii, V.N.: Vestn. Mosk. Univ. Ser. 2, Khim. 26 (1985) 63.
5. Babin, V.N., Gumenyuk, V.V., Solodovnikov, S.P., Belousov, Yu.A.: Z. Naturforsch. 36b (1981) 400.