1. Luxation and avulsion of eyeball during birth;Friedenwald;Am. J. Ophth.,1918
2. Voluntary propulsion of both eyeballs;Ferrer;Am. J. Ophth.,1928
3. Physiology of the Eye;Adler,1965
4. The chief function of the oblique muscles of the eye;Theobald;Bull. Johns Hopkins Hosp.,1918
5. Voluntary propulsion of the eyeballs;Berman;Arch. Int. Med.,1966