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2. Internal timer and spring migration in an equatorial migrant, the Yellow Wagtail (Mntacilla flava);Clrry-Lindahl;Ark. Zool.,1958
3. Quantitative measurement of the influence of photoperiod, temperature, and season on the activity of captive songbirds;Eystefr;Ecological Monographs.,1954
4. Farner . D. S. 1955 The annual stimulus for migration Recent Studies in Avian Biology
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