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Barlow, J., K. A. Forney, P.S. Hill, R.L. Brownell, Jr., J.V. Carretta, D.P. DeMaster, F. Julian, M.S. Lowry, T. Ragen, and R.R. Reeves. U.S. Pacific marine mammal stock assessments: 1996(PDF). NOAA Tech. Mem. NMFS-SWFSC-248. 1997 [2008-03-15]. (原始内容存档(PDF)于2006-10-08).