Gwinner, Eberhard Verhaltensphysiologie, Seewiesen, Max Planck Institut für Ornithologie, Max Planck Society; Emeritus, Seewiesen, Max Planck Institut für Ornithologie, Max Planck Society;
Gwinner, E. (1989). Photoperiod as a modifying and limiting factor in the expression of avian circannual rhythms. Journal of Biological Rhythms, 4(2), 237-250. doi:10.1177/074873048900400210.