1. Follow-up results of Grondahl’s operation for achalasia of the esophagus;Mizai-jan;J Clin Surg (Japan),1972
2. Surgery in idiopathic esophageal achalasia;Tanaka;Shujutsu,1972
3. Cardiomyotomy for achalasia of the cardia;Acheson;Br Med J,1958
4. Surgery of the chest;Wu,1974
5. The modified Heller operation for achalasia of the esophagus;Nemir;Surg Clin North Am,1962