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Field observations of yawning and activity in humans.
Baenninger R, Binkley S, Baenninger M. Baenninger R, et al. Physiol Behav. 1996 Mar;59(3):421-5. doi: 10.1016/0031-9384(95)02014-4. Physiol Behav. 1996. PMID: 8700941 Clinical Trial.