@electronic{xkcd.com,
   title       = {xkcd: Online Communities 2}, 
   url         = {http://xkcd.com/802/},
   biburl      = {https://puma.uni-kassel.de/url/cb51d47263e1a076b2ca6b6a3171ad3a/hotho},
   keywords    = {2.0 art landkarte landscape web},
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@electronic{www.mapplus.ch,
   title       = {MapPlus by TYDAC}, 
   url         = {http://www.mapplus.ch/?size=2},
   biburl      = {https://puma.uni-kassel.de/url/deefe6f54fa20ddaf89bdaaa7709e8a2/stumme},
   keywords    = {Schweiz geop karte landkarte map topo topographische},
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}

@electronic{xkcd.com,
   title       = {xkcd - A webcomic of romance, sarcasm, math, and language - By Randall Munroe}, 
   url         = {http://xkcd.com/256/},
   biburl      = {https://puma.uni-kassel.de/url/4821ba17032573071cab4cfa263cf092/hotho},
   keywords    = {2.0 art artwork bild community grafik internet landkarte map online web},
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