"Screencast: Google Refine 2.0 - Data Augmentation (3 of 3) - using Openstreetmap Nominatim for geocoding and Freebase for augmentation".
^ “Screencast: Google Refine 2.0 - Data Augmentation (3 of 3) - using Openstreetmap Nominatim for geocoding and Freebase for augmentation”. 2012年4月18日閲覧。