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https://developers.google.com/gdata/docs/directory?hl=de

GData-API-Verzeichnis | Google Data APIs | Google for Developers

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https://biuromax.com/oferta/gdata/

GData - biuromax

https://workspaceupdates.googleblog.com/2014/06/calendar-gdata-api-google-calendar.html

Google Workspace Updates: Calendar GData API / Google Calendar Connectors deprecation

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