Poul Heegaard (Portuguese Wikipedia)

Analysis of information sources in references of the Wikipedia article "Poul Heegaard" in Portuguese language version.

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denstoredanske.dk

«Poul Heegaard» (em dinamarquês). Den Store Danske Encyklopædi – Grande Enciclopédia Dinamarquesa. Consultado em 13 de outubro de 2017

Dehn, Max; Heegaard, Poul (1907). «Analysis situs». Enzyklop. d. math. Wissensch. III. [S.l.: s.n.] pp. 153–220. JFM 38.0510.14