1. Motility disorders of the esophagus;Richter,1991
2. Therapeutic uses of botulinum toxin;Jankovic;N Engl J Med,1991
3. Botulinum toxin;Lees;BMJ,1992
4. Injection of botulinum toxin into the distal esophageal sphincter in piglets—a unique investigative technique with potential therapeutic uses;Pasricha;Am J Gastroenterol,1992