1. Mass screening for glaucoma;Brav;JAMA,1951
2. Routine tonometry as part of the physical examination;Zeller;JAMA,1954
3. The Cleveland Glaucoma Survey;Wolpaw;Sight-sav. Rev.,1954
4. The technique and organization of mass screening for glaucoma;Leydhecker;Am. J. Ophth.,1961
5. Clausen: Zentralbl. Ophth., 13:1, 1925. Quoted by Duke-Elder, S.: Textbook of Ophthalmology. London, Kimpton, 1945, v. 3, p. 3328.