De Bruijn–Erdős theorem (incidence geometry) (English Wikipedia)

Analysis of information sources in references of the Wikipedia article "De Bruijn–Erdős theorem (incidence geometry)" in English language version.

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De Bruijn, N. G.; Erdős, P. (1948), "On a combinatioral [sic] problem" (PDF), Indagationes Mathematicae, 10: 421–423