2) Richter JE, Castell DO: Diffuse esophageal spasm : A reappraisal. Ann Int Med 1984. 100: 242-245
3) Harding R, Titchen DA: Chemosensitive vagal endings in the oesophagus of the cat. J Physiol (London) 1975,247:52P-53P
4) Gross NJ : Ipratropium bromide. N Engl J Med 1988,319:486-494
5) Newman SP, Woodman G, Clarke SW, et al : Effect of inspirEase on the deposition of metereddose aerosols in the human respiratory tract. Chest 1986, 89: 551-556