Biebach, Herbert Verhaltensphysiologie, Seewiesen, Max Planck Institut für Ornithologie, Max Planck Society;
Biebach, H., Falk, H., & Krebs, J. R. (1991). The effect of constant light and phase-shifts on a learned time place association in garden warblers (Sylvia borin): Hourglass or circadian clock. Journal of Biological Rhythms, 6(4), 353-365. doi:10.1177/074873049100600406.