| Erscheinungsjahr | ISBN | Autor(en) | Titel |
|---|---|---|---|
| 1993 | 978-3-922602-17-0 | Opportunity 2000--understanding and serving users in an electronic library: 15th International Essen Symposium, 12 October-15 October 1992 to ... (Publications of Essen University Library) | |
| 1994 | 978-3-922602-18-7 | Ahmed H. Helal · Joachim W. Weiss | Resource Sharing: New Technologies as a Must for Universal Availability of Information (16th International Essen Symposium, 18 October-21 October 1993) |
| 1996 | 978-3-922602-21-7 | A. H. /Weiss, J. W. ( Ed.) Helal | Electronic documents and information: From preservation to access: 18th International Essen Symposium, 23 October-26 October 1995: festschrift in ... (Publications of Essen University Library) |