Helm, Barbara Verhaltensphysiologie, Seewiesen, Max Planck Institut für Ornithologie, Max Planck Society;
Helm, B. (2006). Zugunruhe of migratory and non-migratory birds in a circannual context. Journal of Avian Biology, 37(6), 533-540. doi:10.1111/j.2006.0908-8857.03947.x.