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2. Fuchs, E. Textbook of ophthalmology. Ed. 4, p. 472.
3. Studien über die Tiefe der vorderen Augenkammer;Rosengren;Acta Ophthalmologica,1930
4. A practical method of measuring the depth of the anterior chamber;Sugar;Amer. Jour. Ophth.,1942
5. Gonioscopy and glaucoma;Sugar;Arch. of Ophth.,1941