@electronic{stackoverflow.com,
   title       = {Authentification Zend Gdata (403 forbidden) - Stack Overflow}, 
   url         = {http://stackoverflow.com/questions/27011264/authentification-zend-gdata-403-forbidden/27034888#27034888},
   biburl      = {https://puma.uni-kassel.de/url/bc8a3e196687e3304ecc459a4218a4a1/seboettg},
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@electronic{www.consumingexperience.com,
   title       = {A Consuming Experience: How to backup your Google Calendar automatically, regularly, for free}, 
   url         = {http://www.consumingexperience.com/2010/04/how-to-backup-your-google-calendar.html},
   biburl      = {https://puma.uni-kassel.de/url/a975d8eeae9fe92e5ff40354ab8b6d4b/stumme},
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@electronic{www.google.com,
   title       = {Google Kalender}, 
   url         = {https://www.google.com/calendar/render?pli=1},
   biburl      = {https://puma.uni-kassel.de/url/75f2f6f2a09b3ecca16019e8a0f6aa15/stephandoerfel},
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@electronic{userscripts.org,
   title       = {Google Calendar Views for Greasemonkey}, 
   url         = {http://userscripts.org/scripts/show/24338},
   biburl      = {https://puma.uni-kassel.de/url/ffd1bc56d1f447371a96b63fae0a8c18/stephandoerfel},
   keywords    = {calendar google greasemonkey grouping plugin toRead},
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@electronic{calendconf.eu,
   title       = {calendconf}, 
   url         = {http://calendconf.eu/},
   biburl      = {https://puma.uni-kassel.de/url/95ab41c7b4cd7c019515631dad914ab6/benz},
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@electronic{calendconf.eu,
   title       = {calendconf}, 
   url         = {http://calendconf.eu/},
   biburl      = {https://puma.uni-kassel.de/url/95ab41c7b4cd7c019515631dad914ab6/hotho},
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@electronic{www.goosync.com,
   title       = {GooSync}, 
   url         = {http://www.goosync.com/},
   biburl      = {https://puma.uni-kassel.de/url/8ecd92d34f2fa43f448b0d3f587b71d6/benz},
   keywords    = {calendar google syncml},
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@electronic{www.st.ewi.tudelft.nl,
   title       = {Confy's Computer Science Conference Calendar and Call for Papers | Home}, 
   url         = {http://www.st.ewi.tudelft.nl/~mathijs/conf/},
   biburl      = {https://puma.uni-kassel.de/url/48617e8e387fbc488ef497a763499366/stumme},
   keywords    = {calendar call conference for papers},
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@electronic{wiki.mozilla.org,
   title       = {Calendar:GDATA Provider - MozillaWiki}, 
   url         = {http://wiki.mozilla.org/Calendar:GDATA_Provider},
   biburl      = {https://puma.uni-kassel.de/url/12880bf3ba1cf0681a2aeb612c2b82ce/hotho},
   keywords    = {calendar google sync thunderbird},
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@electronic{www.goosync.com,
   title       = {GooSync Home Page}, 
   url         = {http://www.goosync.com/},
   biburl      = {https://puma.uni-kassel.de/url/8ecd92d34f2fa43f448b0d3f587b71d6/hotho},
   keywords    = {calendar google handy sync},
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@electronic{www.rememberthemilk.com,
   title       = {Remember The Milk}, 
   url         = {http://www.rememberthemilk.com/},
   biburl      = {https://puma.uni-kassel.de/url/95ede5f3a5b453037b5f914c1ed91231/hotho},
   keywords    = {calendar web 2.0 tools tagging remember kalender},
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@electronic{www.rememberthemilk.com,
   title       = {Remember The Milk}, 
   url         = {http://www.rememberthemilk.com/},
   biburl      = {https://puma.uni-kassel.de/url/95ede5f3a5b453037b5f914c1ed91231/stumme},
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@electronic{www.google.com,
   title       = {Google Calendar}, 
   url         = {http://www.google.com/calendar/render},
   biburl      = {https://puma.uni-kassel.de/url/b924ab062dfb8c5173521eab6d2c2947/hotho},
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@electronic{www.grinn.net,
   title       = {Incorporate Google Calendar Into Outlook}, 
   url         = {http://www.grinn.net/blog/dev/2006/04/incorporate-google-calendar-into.html},
   biburl      = {https://puma.uni-kassel.de/url/915669202c6b31b84419ae8236ed932f/hotho},
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@electronic{www.30boxes.com,
   title       = {30 Boxes | it's your life}, 
   url         = {http://www.30boxes.com/},
   biburl      = {https://puma.uni-kassel.de/url/153647b1554e6ddb0b13cdd8d41e2819/hotho},
   keywords    = {calendar social folksonomy kalender},
   added-at    = {2006-02-15T07:22:22.000+0100},
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