1. Sleisenger MH, Fordtran JS: Gastrointestinal Disease Pathophysiology—Diagnosis—Management. WB Saunders Co, Philadelphia 1978
2. Laufer I: Double-Contrast Gastrointestinal Radiology. WB Saunders Co. Philadelphia, 1979
3. Role of Gastroscopy in Gastric Ulcer Patients
4. Double-blind study of single and double contrast upper gastrointestinal examinations using endoscopy as a control