1. Hall, D. M., Turner, E. E.: J. Chem. Soc. 1955, 1242
2. Weber, E., Csöregh, I., Stensland, B., Czugler, M.: J. Am. Chem. Soc. 106, 3297 (1984)
3. An experimental note of Ref. 1 only vaguely suggests possible “solvate formation”
4. Encyclopaedia Britannica USA, Instant Service Report R-1519, Britannica Centre, 310 South Michigan Ave, Chicago, IL 60604
5. Brown Jr., J. F.: Sci. Am. 207, 82 (1962)