1. Extension deformities of the proximal interphalangeal joints of the fingers;Kaplan;J Bone Joint Surg [Am],1939
2. Handbuch der Anatomie and Mechanik der Gerlenke;Fick,1904
3. Injuries to the ligaments of the thumb and fingers;Moberg;Acta Chir Scand,1953
4. The anatomy of the volar part of the capsules of the finger joints;Gad;J Bone Joint Surg [Am],1967
5. The proximal interphalangeal joint;Kuczynski;J Bone Joint Surg [Am],1968