Days: A History of British Styling, Quartet Books, 1999. Franbourg A., Hallegot P., Baltenneck F., Toutain C. and Leroy F., "Current research on ethnic hair", Journal of the American Academy of Dermatology, June 2003, pp 8115–8119. 16 references. (Available on internet). The Hairdressers' Weekly Journal, published weekly for "Hairdressers, Wigmakers and Perfumers" since 1881, covering all aspects of contemporary hairdressing and is therefore an invaluable and authoritative source. An almost complete set to the present day is held by the London College of Fashion, 20 John Prince's Street, London. Liu, Christine, Le Gala Hair Group: Introducing the digital perm, Boston's Weekly Dig, Wednesday, January 31, 2007, Issue 9.5. Martin K., "4. Infrared and Raman Studies of Skin and Hair: A review of cosmetic spectroscopy", The Internet Journal of Vibrational Spectroscopy Vol. 3 Ed 2 2004, 45 references. Nessler, Charles of C. Nestle Company, Self-published, "Hair types and how to curl hair using the circuline process", 1926 External links Pictures of Nessler's permanent curling machine Disulfide bonds in hair The chemistry of a permanent wave A Complete Guide to Beach Wave Perms German inventions Hairdressing Hairstyles