Publisher
Springer Science and Business Media LLC
Reference2 articles.
1. "On the Incidence of Daylight as a determining Factor in Bird Migration," E. A. Schäfer, NATURE, vol. 77, pp. 159–163 (December 19, 1907).
2. "Is Photoperiodism a Factor in the Migration of Birds?" G. Eifrig, Auk, vol. 41, pp. 439–444.
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