BRADY, J V Avoidance behavior and the development of gastroduodenal ulcers. [electronic resource] - Journal of the experimental analysis of behavior Jan 1958 - 69-72 p. digital Publication Type: Journal Article ISSN: 0022-5002 Standard No.: 10.1901/jeab.1958.1-69 doi Subjects--Topical Terms: HumansLearningPeptic Ulcer