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   title       = {SpringerLink - Journal}, 
   url         = {http://www.springerlink.com/content/100309/},
   biburl      = {https://puma.uni-kassel.de/url/3d5afe21f7240957b3678e53f15125b2/hotho},
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@electronic{videolectures.net,
   title       = {VideoLectures - exchange ideas & share knowledge}, 
   url         = {http://videolectures.net/},
   biburl      = {https://puma.uni-kassel.de/url/36ec82ee148c089ef2b2d91b04882fb6/hotho},
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