1. Scleroderma;Ortonne;Clin Exp Dermatol,1980
2. Morphea and scleroderma;Nordlung,1998
3. Functional melanonychia due to involvement of the nail matrix in systemic lupus erythematosus;Skowron;J Am Acad Dermatol,2002
4. Localized cutaneous scleroderma;Winkelmann;Semin Dermatol,1985
5. Davidson's principle and practice of medicine,1999