10. Atlas Chemical Co., Birt. Patent, 953496 (1964)
11. Bellamy LJThe Infra-red Spectra of Complex Molecules, 4th ed., p. 13, Methuen and Co. Ltd., London (1966)
12. Bellamy LJThe Infra-red Spectra of Complex Molecules, 4th ed., p. 179, Methuen and Co. Ltd., London (1966)
13. Hummel DIdentification and Analysis of Surface-Active Agents by Infra-red and CHemical Methods, 1st ed., p. 133, John Wiley and Sons Inc., Sydney (1962)
14. Lambert JBOrganic Structual Analysis, 1st ed., p. 246, Macmillan Publishing Co. Inc., New York (1976)
15. Sai IR, Konsei KT, Ryusei SISurfactant Handbook, 18th ed., p. 791, Sankyo Tosho Co., Tokyo (1979)