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SIDMAN M. Avoidance conditioning with brief shock and no exteroceptive warning signal. Science. 1953 Aug 7;118(3058):157–158.[PubMed]
CONGER JJ, SAWREY WL, TURRELL ES. An experimental investigation of the role of psychological factors in the production of gastric ulcers in rats. J Comp Physiol Psychol. 1956 Oct;49(5):457–461.[PubMed]
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