Helm, Barbara Verhaltensphysiologie, Seewiesen, Max Planck Institut für Ornithologie, Max Planck Society;
Helm, B. (2009). Geographically distinct reproductive schedules in a changing world: Costly implications in captive Stonechats. Integrative and Comparative Biology, 49(5), 563-579. doi:10.1093/icb/icp037.