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2. Continuous electrocardiographic monitoring employing the electrocardiocorder during gastrointestinal endoscopy;Serebro;Gastrointestinal Endoscopy,1967
3. Electrocardiography during upper gastrointestinal endoscopy;De Masi;Gastrointestinal Endoscopy,1969
4. Electrocardiographic response to upper gastrointestinal endoscopy;McEwan-Alvarado;Am J Gastroent,1972
5. Electrocardiographic abnormalities associated with the barium enema;Eastwood;JAMA,1972