@electronic{ir.dcs.gla.ac.uk,
   title       = {Terrier Information Retrieval Platform}, 
   url         = {http://ir.dcs.gla.ac.uk/terrier/},
   biburl      = {https://puma.uni-kassel.de/url/f913a322cb71271d7fc48093ec5ef1a4/hotho},
   keywords    = {engine ir java search web},
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@electronic{mg4j.dsi.unimi.it,
   title       = {MG4J: Managing Gigabytes for Java™}, 
   url         = {http://mg4j.dsi.unimi.it/},
   biburl      = {https://puma.uni-kassel.de/url/8c0faeaf289c097e6393fbd09bce08e7/hotho},
   keywords    = {java retrieval tools ir information},
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