Carl Gustav Axel Harnack (English Wikipedia)

Analysis of information sources in references of the Wikipedia article "Carl Gustav Axel Harnack" in English language version.

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1books.google.com

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books.google.com

Harnack, Axel; George L. Cathcart. "An Introduction to the Study of the Elements of the Differential and Integral Calculus" London: Williams and Norgate, 1891, p. 6.