Ottvall, Richard, and Jan Pettersson. “Habitat Choice, Home Range Size and Site Fidelity of the Corncrake Crex Crex on Öland, Sweden: A Radio Telemetry Study”. Ornis Svecica 8, no. 3 (July 1, 1998): 65–76. Accessed January 20, 2022. https://journals.lub.lu.se/os/article/view/23127.