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    Proc Natl Acad Sci U S A. 1998 Aug 18;95(17):9720-3.

    Two empires or three?

    Mayr E.

    Professor Emeritus, Museum of Comparative Zoology, Harvard University, 26 Oxford Street, Cambridge, MA 02138, USA. emayr@oeb.harvard.edu

    PMID: 9707542 [PubMed - indexed for MEDLINE]

    PMCID: 33883

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