1. The nail in health and disease;Zaias,1980
2. Glossary of nail abnormalities;Norton,1987
3. Onychoschizia: scanning electron microscopy;Shelley;J Am Acad Dermatol,1984
4. Diseases of the nails;Pardo-Castello,1960
5. Incidence of brittle nails;Lubach;Dermatologica,1986