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2. Boles , C.L. 1979 Treatment of upper airway abnormalities Vet. Clin. N. Am.: Large Anim. Pract 127 147
3. Epiglottic entrapment by arytenoepiglottic folds in the horse;Boles;J. Am. vet. med. Ass.,1978
4. Some observations on disease of the ear, nose and throat in the horse, and endoscopy using a flexible fibreoptic endoscope;Cook;Vet. Rec.,1974