1. Extramukose kardioplastik beim chronischen kardiospasmus mit dilatation des oesophagus;Heller;Mitt Grenzgeb Med Chir,1914
2. Cardiospasm in the aged;Zaaijer;Ann Surg,1923
3. Surgical treatment of cardiospasm (achalasia of the esophagus): considerations of aspects of esophagomyotomy;Ellis;J Am Med Assoc,1958
4. Endoscopic myotomy in the treatment of achalasia;Ortega;Gastrointest Endosc,1980
5. Laparoscopic cardiomyotomy for achalasia;Shimi;J R Coll Surg Edinb,1991