@electronic{www.springerlink.com,
   title       = {ICCS 07 1999}, 
   url         = {http://www.springerlink.com/content/j45803886727/},
   biburl      = {https://puma.uni-kassel.de/url/8e94eee49b50d2accae60d103b457c07/stephandoerfel},
   keywords    = {07 10th 1999 ICCS},
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@electronic{www.cs.rutgers.edu,
   title       = {Data Clustering: A Review}, 
   url         = {http://www.cs.rutgers.edu/~mlittman/courses/lightai03/jain99data.pdf},
   biburl      = {https://puma.uni-kassel.de/url/e17b7bd1a05155a49f881b2246154f84/hotho},
   keywords    = {clustering text survey 1999},
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