9kumar V P, sathu K. Treatment and prevention of "hook -nail" deformity with anatomic correlation [ J]. J hand surg(Mn) ,1993,18A (4):617.
10Vance D E, Ehmann W D, Markeshery W R. A searchfor longitudinal Variations in trace element levels in nailsoAlzheimer's disease patients [ J . Biol Trace Elem Res, 1990 (3) :312.
