Journal Article
Thorup, K.; Bisson, I.-A.; Bowlin, M. S.; Holland, R. A.; Wingfield, J. C.; Ramenofsky, M.; Wikelski, M.: Evidence for a navigational map stretching across the continental US in a migratory songbird. Proceedings of the National Academy of Sciences of the United States of America
104 (46), pp. 18115 - 18119 (2007)