@electronic{de.wikibooks.org,
   title       = {Heapsort in Java}, 
   url         = {http://de.wikibooks.org/wiki/Algorithmensammlung:_Sortierverfahren:_Heapsort},
   biburl      = {https://puma.uni-kassel.de/url/dd7f6abb313ccaee49f7606322c8a111/nilsrehwald},
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@electronic{www.springer.com,
   title       = {LNCS Guidelines}, 
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@electronic{books.google.de,
   title       = {Sorting Algorithms}, 
   url         = {http://books.google.de/books?id=L-JI3xCb5-kC&pg=PA606&dq=sorting+algorithm&hl=de&sa=X&ei=2kSuUaftFOWA4gSDyYH4CQ&ved=0CDkQ6AEwAQ#v=onepage&q=sorting&f=false},
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@electronic{books.google.de,
   title       = {Algorithmen}, 
   url         = {http://books.google.de/books?id=5uA1c8TuOC0C&pg=SA9-PA25&dq=T.+H.+Cormen,+C.+E.+Leiserson,+R.+L.+Rivest,+C.+Stein:+Introduction+toAlgorithms,+Second+Edition.+MIT+Press,+Cambridge,+2001&hl=de&sa=X&ei=kEOuUcqfH6314QSGgIHwBQ&ved=0CEIQ6AEwAg#v=onepage&q&f=false},
   biburl      = {https://puma.uni-kassel.de/url/10a36fd675db771d0a238997ec34dd9f/nilsrehwald},
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@electronic{www.poeschko.com,
   title       = {Sortieralgorithmen}, 
   url         = {http://www.poeschko.com/media/math/sort_report.pdf},
   biburl      = {https://puma.uni-kassel.de/url/792384bf57559b8367a7194df3321f0f/nilsrehwald},
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