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  1.  24
    Der ganzheitsbegriff in der systematik.Heinrich Frieling - 1940 - Acta Biotheoretica 5 (3):117-138.
    Kleinschmidt's definition of the “Weltformenkreis” as the smallest systematical unit of affinity removes any danger of obliterating the type and at the same time opens a way for judging the superior taxonomic groups on principle differently from the subspecies of a “Formenkreis”.It is demonstrated that the characters of geographical subspecies are characters of apparent shaping, those of the species however are characters of construction and qualitative and autonomic ones. It is the type differentiating in quality that justifies the definition of (...)
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  2.  6
    Harmonie und rhythmus in natur und kunst.Heinrich Frieling - 1937 - Berlin: R. Oldenbourg.
    FRIELING: HARMONIE UND RHYTHMUS IN NATUR UND KUNST.
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