Ottvall, R. and Pettersson, J. 1998. Habitat choice, home range size and site fidelity of the Corncrake Crex crex on Öland, Sweden: a radio telemetry study. Ornis Svecica. 8, 3 (Jul. 1998), 65–76. DOI:https://doi.org/10.34080/os.v8.23127.