Poulsen, H. (1949). Wird die Sperrreaktion von Verfinsterung ausgelöst?. Ornis Fennica, 26(3), 65–67. Hämtad från https://ornisfennica.journal.fi/article/view/132516
Ornis Fennica is a peer-reviewed international ornithological journal published by BirdLife Finland. We publish analytical and experimental papers on the ecology, behaviour and biogeography of birds. Ornis Fennica is published quarterly with online early practice.