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2. Lesions of the ocular posterior segment of raptors;Buyukmihci;J Am Vet Med Assoc,1985
3. The investigation of visual defects in raptors;Greenwood,1981
4. Disorders of the third eyelid in birds: 17 cases;Kern;J Avian Med and Surgery,1996
5. Raptor ophthalmology;Murphy;Comp Contin Educ,1987