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![Cover for Stefan Helber · Operations Research Proceedings 2012: Selected Papers of the International Annual Conference of the German Operations Research Society (GOR), Leibniz University of Hannover, Germany, September 5-7, 2012 - Operations Research Proceedings (Paperback Book) [2014 edition] (2013)](https://imusic.b-cdn.net/images/item/original/946/9783319007946.jpg?stefan-helber-2013-operations-research-proceedings-2012-selected-papers-of-the-international-annual-conference-of-the-german-operations-research-society-gor-leibniz-university-of-hannover-germany-september-5-7-2012-operations-research-proceedings-paperback&class=scaled&v=1397695895)
![Cover for Stefan Helber · Call Center Management in der Praxis: Strukturen und Prozesse betriebswirtschaftlich optimieren (Paperback Book) [Softcover reprint of the original 1st ed. 2004 edition] (2012)](https://imusic.b-cdn.net/images/item/original/515/9783642620515.jpg?stefan-helber-2012-call-center-management-in-der-praxis-strukturen-und-prozesse-betriebswirtschaftlich-optimieren-paperback-book&class=scaled&v=1408506957)
![Cover for Stefan Helber · Performance Analysis of Flow Lines with Non-Linear Flow of Material - Lecture Notes in Economics and Mathematical Systems (Paperback Book) [Softcover reprint of the original 1st ed. 1999 edition] (1999)](https://imusic.b-cdn.net/images/item/original/549/9783540659549.jpg?stefan-helber-1999-performance-analysis-of-flow-lines-with-non-linear-flow-of-material-lecture-notes-in-economics-and-mathematical-systems-paperback-book&class=scaled&v=1582936080)