1. Arkhipova, G. P., Mischenko, K. P. and His, I. E.: 1968, Zh. Prikl. Khim (Leningrad) 41, 1131.
2. Baly, E. C. C. and Bailey, R. A.: 1922, J. Chem. Soc. 121, 1813.
3. Beilke, S. and Georgii, H. W.: 1968, Tellus 20, 435.
4. Butcher, K. L., Hanson, C. and Plewes, J. A.: 1962, Chem. Ind. (London), 355.
5. Cortelyou, C. G.: 1969, Chem. Eng. Progr. 65, No. 9, 69.