1. Berthelot, M.; Jungfleisch, J.: Ann. Chim. Phys. 26 (1872) S. 396.
2. Power, K. L.: Paper 175, in Proceed. ISEC 71, Ed.: Soc. Chem. Ind., London 1971.
3. Flett, D. S.: Chem. Ind. (London) (1977) S. 706/712.
4. Bailes, P. J.; Hanson, C.; Hughes, M. A.: Chem. Eng. 30. Aug. (1976) S. 86/94.
5. Fletcher, A. W.: Chem. Ind. (London) 5. May (1973) S. 414/419.