1. Linking to the appropriate copy: Report of a DOI-based prototype;Beit-Arie;D-Lib Magazine,2001
2. A lesson in linking;Caplan;Library Journal,2001
3. Context-sensitive linking: It's a small world after all;Collins;Serials Review,2002
4. CrossRef. (2003). DOI info and guidelines (On-line). Available: http://crossref.org/01company/15doi_info.html. Accessed October 30, 2003.
5. Friedlander, A. (2002). Dimensions and use of the scholarly information environment: Introduction to a data set assembled by the Digital Library Federation and Outsell (On-line). Available: http://www.clir.org/pubs/reports/pub110/contents.html.