1. D.A. Dowden, D. Wells: In Actes 2e Congres Int. de Cata-lyse, Vol.2, Paris 1960 ( Technipress, Paris 1961 ) p. 1489
2. D.A. Dowden, N. Mackenzie, B.M.W. Trapnell: Proc. Roy. Soc. A237, 247 (1956)
3. F. Basolo, R.G. Pearson: Mechanisms of Inorganic Reactions, 2nd ed. ( Wiley, New York 1967 )
4. D.A. Dowden: Anal. Real. Soc. Espanol Fis. y Quim. B61, 177 (1965)
5. K.S. De, M.J. Rossiter, F.S. Stone: In Proc. 3rd. Int’l Congress Catalysis, Vol.1, Amsterdam 1964 ( North-Holland, Amsterdam 1965 ) p. 520