TY  - RPRT
TI  - Are migrating raptors guided by a geomagnetic compass?
AU  - Kasper Thorup
AU  - Mark R. Fuller
AU  - T. Alerstam
AU  - M. Hake
AU  - N. Kjellen
AU  - R. Standberg
PY  - 2006
UR  - https://pubs.usgs.gov/publication/1016435
ID  - 1016435
ER  -