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Citations
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Ruckebusch Y,. (1975). The hypnogram as an index of adaptation of farm animals to changes in their environment. App Anim Ethol, 2, 3–18.
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Ruckebusch Y,. (1972). The relevance of drowsiness in the circadian cycle of farm animals. Anim Beh, 20, 637–643.
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