1. Electrocardiographic changes during routine sigmoidoscopy;Fletcher;Arch Int Med,1968
2. Survey of gastroscopic and esophagoscopic accidents;Palmer;JAMA,1957
3. Cardiac arrest during gastroscopy;Katz;Gastroenterology,1957
4. Continuous electrocardiographic monitoring employing the electrocardiocorder during gastrointestinal endoscopy;Serebro;Gastrointestinal endoscopy,1967
5. Electrocardiography during upper gastrointestinal endoscopy;DeMasi;Gastrointestinal Endoscopy,1969