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WikiPedia: Kurt Hensel http://www.digizeitschriften.de/resolveppn/GDZPPN0... http://gdz.sub.uni-goettingen.de/dms/load/img/?PPN... http://www-gdz.sub.uni-goettingen.de/cgi-bin/digbi... http://quod.lib.umich.edu/cgi/t/text/pageviewer-id... http://www.ams.org/journals/bull/1910-17-01/S0002-... http://www.ams.org/journals/bull/1914-20-05/S0002-... //doi.org/10.1090%2FS0002-9904-1910-01993-5 //doi.org/10.1090%2Fs0002-9904-1914-02480-2 https://portal.dnb.de/opac.htm?method=simpleSearch... https://archive.org/details/elementarynumber00rose...