1.  14
    Harold F. Blum (1953). Time's Arrow and Evolution. Philosophy and Phenomenological Research 13 (3):420-421.
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  2.  25
    Harold F. Blum (1963). Complexity and Organization. Synthese 15 (1):115 - 121.
  3. Harold F. Blum (1957). On the Origin of Self-Replicating Systems. In D. Rudnick (ed.), Rhythmic and synthetic properties in growth. Princeton University Press 155–70.