Hjelmslev transformation (English Wikipedia)

Analysis of information sources in references of the Wikipedia article "Hjelmslev transformation" in English language version.

refsWebsite

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1stmarys-ca.edu

low place

low place

stmarys-ca.edu

Lobachevski, Nicholas (1914). Geometrical Researches on The Theory of Parallels (PDF). Chicago, Illinois: The Open Court Publishing Company. pp. 13–14 (Theorem 16), 19–21 (Theorem 23).