1. Arch;ALPER, M.G.;Ophthal. (Chicago),1963
2. Trans;COLLINS, E.;TREACHER,1892
3. Trans;D'OMBRAIN, A.;ophthal. Soc. Aust; Brit,1945
4. Trans;HOWARD, G.M.; HUTCHINSON, B.T.; FREDERICK, A.R.;Amer. Acad. Ophthal. Otolaryng; Acta ophthal,1965
5. Arch;SPAETH, G.L.;Ophthal. (Chicago); Acta ophthal,1967