A method for investigating population declines of migratory birds using stable isotopes: origins of harvested lesser scaup in North America.
Hobson KA, Wunder MB, Van Wilgenburg SL, Clark RG, Wassenaar LI. A method for investigating population declines of migratory birds using stable isotopes: origins of harvested lesser scaup in North America. PLoS One. 2009 Nov 25; 4(11):e7915.