Persistent organic pollutants in the blood of free-ranging sea otters (Enhydra lutris ssp.) in Alaska and California - Jessup, David A.; Johnson, Christine K.; Estes, James; Carlson-Bremer, Daphne; Jarman, Walter; Reese, Stacey; Dodd, Erin; Tinker, M.; Ziccardi, Michael (Journal of Wildlife Diseases, 2010)