1. Schönfeldt, N., Surface Active Ethylene Oxide Adducts, Pergamon, Oxford, 1969, p. 20 (rev. edn. in German: Schönfeldt, N., Grenzflächenactive Äthylenoxid-Adducte, Ergänzungsband, Wissenschaftliche V., Stuttgart, 1984).
2. Sachat, N., and Greenwald, H.L., Mechanism of Ethylene Oxide Condensation, in Nonionic Surfactants, edited by M.J. Schick, Marcel Dekker, New York, 1967, p. 8.
3. Mulley, B.A., Synthesis of Homogeneous Nonionic Surfactants, in Nonionic Surfactants, edited by M.J. Schick, Marcel Dekker, New York, 1967, p. 421.
4. Goldsmith, H.A., Glycol Derivatives, Chem. Rev. 33:257 (1943).
5. Sallay, P., J. Morgós, L. Farkas, and I. Rusznák, Preparation of Homogeneous Tensides, Acta Chim. Hung. 102:85 (1979).