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- Encyclopedia of marine mammals / editors, William F. Perrin, Bernd Würsig, J.G.M. Thewissen. Amsterdam ; Boston, Mass. : Elsevier/Academic Press, [2009] ©2009 . 1 online zdroj (xxxiv, 1316 stran)
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- Return to the sea : the life and evolutionary times of marine mammals / Annalisa Berta. Berkeley, CA : University of California Press, 2012 . 1 online zdroj (xiii, 205 stran)
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