1. Elektronische Zeitschriften. Eine Einführung;Keller,2001
2. Patterns of Journal Use by Scientists through Three Evolutionary Phases;Tenopir;D-Lib Magazine [Online],2003
3. Ibid.
4. Electronic Journals, the Internet, and Scholarly Communication;Kling;Annual Review of Information Science and Technology,2003
5. Ulrichsweb.com™ Available: http://www.ulrichsweb.com/ulrichsweb/ (subscription needed).