1964 - 1999

• Computer Science Bibliography - Universität Trier

1972 - 2000

• The Collection of Computer Science Bibliographies

1972 - 2001

• ACM Portal - The Guide to Computing Literature
• ACM Digital Library

1991 - 1999

• CiteSeer.IST - Scientific Literature Digital Library

1993 - 1996

• Stanford Rapide Project Publications

1997 - 1999

• PAVG Complex Event Publications