1. Yu. A. Lebedev, E.A. Miroshnickenko and A.M. Chaikin, Dokl. Akad. Nauk. SSSR, 145, 751 (1962).
2. P.A. Fowell and C.T. Mortimer, J. Chem. Soc. 3793 (1961).
3. L.H. Long and R.G.W. Norrish, Phil. Trans. Roy. Soc. London, A241, 587 (1949).
4. W.F. Lautsch, P. Erzberger and A. Tröber, Wiss. Z. Tech. Hochsch. Chem. Leuna-Merseburg, 1, 31 (1958).
5. A.S. Carson, K. Hartley and H.A. Skinner, Trans. Faraday Soc. 45, 1159 (1949).