Bierwagen Britta G, Rahel Frank J, Thomas Roxanne
National Center for Environmental Assessment, Office of Research and Development, U.S. Environmental Protection Agency, 1200 Pennsylvania Avenue, NW, Washington, D.C. 20460, USA.
Conserv Biol. 2008 Jun;22(3):518-20. doi: 10.1111/j.1523-1739.2008.00958.x.