* Hall J.H, Wimpson J. W. and Williams D.A, (2005), Disorders of the Pharynx and Oesophagus, in BSAVA Manual of Canine and Feline Gastroenterology, 2nd Edition, British Small Animal Association, Gloucester, pp 142-143 | * Hall J.H, Wimpson J. W. and Williams D.A, (2005), Disorders of the Pharynx and Oesophagus, in BSAVA Manual of Canine and Feline Gastroenterology, 2nd Edition, British Small Animal Association, Gloucester, pp 142-143 |