1. 1) Taylor JS; Nickel—The ubiquitous contact allergen; in Contact Dermatitis, 3rd ed (Fisher AA ed), Lea & Febriger, Philadelphia, 1986, 745-761.
2. 2) Ackerman AB; Hand dermatitis due to contactants; in Contact Dermatitis, 3rd ed (Fisher AA ed), Lea & Febriger, Philadelphia, 1986, 272-273.
3. 3) Cronin E: Metals; in Contact Dermatitis, (Edinburge CE ed), Churchill Livingstone, London 1980, 279-390.
4. 4) De Groot AC; Patch testing, Elsevier, Amsterdam-New York-Oxford, 1986, 12-262.
5. 5) Calnan CD; Nicekel sensitivity in women. Arch. Allerg. Appl. Immunol. 11: 73-80, 1957.