1. P. K. Wong and J. E. Willard, J. Phys. Chem., 72, 2623 (1968); 73, 2226 (1969).
2. P. -O. Kinell, A. Lund, and T. Vanngard, Acta Chem. Scand., 19, 2113 (1965); J. Chem. Phys., 46, 3679 (1967).
3. Z. L. Krylov and P. I. Dolin, Kinetika i Kataliz, 7, 977 (1966); Khim. Vys. énerg., 3, 133 (1969).
4. G. B. Pariiskii, V. B. Kazanskii, and V. V. Voevodskii, Kinetika i Kataliz, 5, 96 (1964).
5. R. Dietz, Trans. Amer. Nucl. Soc., 7, 314 (1964).