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![Cover for Alexander Hars · Referenzdatenmodelle: Grundlagen Effizienter Datenmodellierung - Schriften Zur Edv-Orientierten Betriebswirtschaft (Paperback Book) [Softcover Reprint of the Original 1st 1994 edition] (2012)](https://imusic.b-cdn.net/images/item/original/983/9783322903983.jpg?alexander-hars-2012-referenzdatenmodelle-grundlagen-effizienter-datenmodellierung-schriften-zur-edv-orientierten-betriebswirtschaft-paperback-book&class=scaled&v=1514436262)
![Cover for Alexander Hars · From Publishing to Knowledge Networks: Reinventing Online Knowledge Infrastructures (Paperback Book) [Softcover reprint of hardcover 1st ed. 2003 edition] (2010)](https://imusic.b-cdn.net/images/item/original/802/9783642056802.jpg?alexander-hars-2010-from-publishing-to-knowledge-networks-reinventing-online-knowledge-infrastructures-paperback-book&class=scaled&v=1604315757)
![Cover for Alexander Hars · From Publishing to Knowledge Networks: Reinventing Online Knowledge Infrastructures (Hardcover Book) [2003 edition] (2003)](https://imusic.b-cdn.net/images/item/original/504/9783540012504.jpg?alexander-hars-2003-from-publishing-to-knowledge-networks-reinventing-online-knowledge-infrastructures-hardcover-book&class=scaled&v=1535405494)