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3. Becker, B.: Glaucoma. Tr. II Conf. Josiah Macy, Jr. Foundation (F. W. Newell, Ed.) New York, 1956, p. 195.
4. The coefficient of scleral rigidity in normal and glaucomatous eyes;Drance;AMA Arch. Ophth.,1960
5. The origin of functional deficiencies in the hypertensive eye;Weekers;Doc. Ophth.,1959