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  1. Arithmetical definition of the species, subspecies, and race concept, with a proposal for a modified Nomenclature
    By: Ginsburg, Issac
    Type: Article
    In: Zoologica : scientific contributions of the New York Zoological Society.
    Volume: 23
    Issue: 13
    Date: 1938
    Page Range: 253--286
    Publication info: New York.1907-1974.
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  2. Certain measures of intergradation and divergence
    By: Ginsburg, Issac
    Type: Article
    In: Zoologica : scientific contributions of the New York Zoological Society.
    Volume: 39
    Issue: 4
    Date: 1954
    Page Range: 31--35
    Publication info: New York.1907-1974.
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