1. Lesions associated with ageing;Anver,1979
2. The alimentary system;Barker,1985
3. Achalasia of the oesophagus: pathologic and etiologic considerations;Cassella;Annals of Surgery, 160,1964
4. Myenteric ganglial cells of the oesophagus in cats with achalasia of the oesophagus;Clifford;American Journal of Veterinary Research, 34,1973
5. Myenteric ganglial cells in dogs with and without achalasia of the oesophagus;Clifford;Journal of the American Veterinary Medical Association, 150,1967