1. Allergy to copper derived from dental alloys as a possible cause of oral lesions of lichen planus;Frykholm;Acta Derm Venereol (Stockh),1969
2. Oral manifestations of gold allergy;Laeijendecker;J Am Acad Dermatol,1994
3. Lichen ruber durch Kontaktsensibilisierung durch Goldsalze?;Rank;Zbl Haut,1993
4. Hypersensitivity to palladium is linked to oral lichen planus. Dermatology News (Feb 1982) (cited in Camarasa JG, Burrows D, Menné T, Wilkinson JD, Shaw S. Palladium contact sensitivity;Nakayama;Contact Dermatitis,1991
5. Contact mucositis due to palladium;Downey;Contact Dermatitis,1989