Charles Thomas Kowal (8 novembre 1940, Buffalo (New York)-28 novembre 2011, Cinebar, Washington) était un astronome américain.
ISNI is an international certified number (ISO 27729) that uniquely identifies persons and organisations.
IdRef is the authority database (author, title) of the union catalogue for France's higher education libraries (SUDOC)
The Virtual International Authority File (VIAF) is an international authority file. It is a joint project of several national libraries
DBpedia is a project aiming to extract structured content from the information created as part of the Wikipedia project.