1. Nail growth: 30 years of observation
2. A. A. Berthold(1850 ) Beobachtungen uber das quantitative Verhaltniss der Nagel-und Haarbildung beim Menschen . Archives of Anatomy and Physiology, 156 -160 .
3. FINGERNAIL GROWTH IN NORMAL AND PSORIATIC SUBJECTS
4. STUDIES IN NAIL GROWTH