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2. Diseases of the Eye;deSchweinitz,1921
3. Posey, W. C.: Ophthalmic Record, 1908, p. 346.
4. The role of developmental anomalies in vertical muscle defects;Fink;Am. J. Ophthalmol.,1955
5. Inferior oblique weakening;Dunlap;Ann. Ophthalmol.,1972