ed. [1980], 271-83.

Hempel, C. [1965]:

Aspects of Scientific Explanation.

New York: The Free

Herfel, W. E. et al.

eds. [1995]:

Theories and Models in Scientific Processes.

Amsterdam: Rodopi.

Hoyningen-Huene, P. [1993]:

Reconstructing Scientific Revolutions.

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