1. Schick, M. J., Nonionic Surfactants (New York 1967).
2. Corkill, J. M., J. F. Goodman, andJ. Wyer, Trans. Faraday Soc.65, 9 (1969).
3. König, H., Z. Anal. Chem.251,225 (1970).
4. Shinoda, K., Personal communication.
5. Friberg, S., L. Mandell, and P. Ekwall, Proc. 5th Int. Congr. Surf. Act. Subst., Barcelona II, 1121 (1969).