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. Lund, Sweden, 8(3), pp. 65–76. doi: 10.34080/os.v8.23127.