1. Hereditary anchylosis of the proximal phalangeal joints (symphalangism);Cushing, H.;Genetics,1916
2. Anomalies and Curiosities of Medicine;Gould, G.M.; Pyle, W.L.,1956
3. Mendelian Inheritance in Man;York. McKusick, V.A.,1978
4. Although the aetiology of the constellation offindings in this patient is unknown, there is some indication that they may be of genetic origin. Symphalangism by itself is almost always genetically determined,1978