1. Willis T. Pharmaceutics transrationalis: sevediatriba de medicamentoum: operation-nibus in humano corpore. London: Haguae-Comitas; 1674.
2. Extramukose cardioplastik beim chronischen cardiospasmus mit dilatation des oesophagus;Heller;Mitt Grenzgeb Med Chir,1913
3. Diagnosis and treatment of spasmodic stricture of the esophagus;Russel;Brit Med J,1898
4. Hellemans J;VanTrappen;Treatment of achalasia and related motor disorders. Gastroenterology,1980
5. Laparoscopic Heller myotomy and fundoplication for achalasia;Hunter;Ann Surg,1997