1. Goldman L, Coover GD, Levine S. (1973). Bidirectional effects of reinforcement shifts on pituitary-adrenal activity. Physiology and Behavior, 10: 209–214.
2.
2. Overmier JB., Murison R, Skoglund EJ, Ursin H. (1985). Safety signals can mimic responses in reducing the ulcerogenic effects of prior shock. Physiological Psychology, 13: 243–247.
3.
3. Coover GD., Murison R, Sundberg H, Jellestad F, Ursin H (1984). Plasma corticosterone and meal expectancy in rats: Effects of low probability cues. Physiology and Behavior, 33: 179–184.
4.
4. Ursin H, Olff M (1992). The stress response. Chapter 1 in: Stanford C, Salmon P, Gray J: Stress: An integrated response. London, Academic Press, in press.
