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International library cooperation : 10th Anniversary Essen Symposium, 19 October - 22 October 1987 ; Festschr. in honour of Prof. Dr. Günther Pflug to his 65th birthday
Helal, Ahmed H. (contributor); Pflug, Günther (honouree);  … - 1988
Persistent link: https://www.econbiz.de/10000420428
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Impact of new information technology on international library cooperation
Helal, Ahmed H. (contributor); Weiss, Joachim W. (contributor) - 1987
Persistent link: https://www.econbiz.de/10000070955
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Future of library networks : Essen Symposium, 16 September - 18 September 1981
Helal, Ahmed Helmi (ed.); Boßmeyer, Christine (contributor) - 1982
Persistent link: https://www.econbiz.de/10000011349
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Hierarchical relationship in bibliographic descriptions
Bonnes, E. (contributor); Helal, Ahmed (contributor);  … - 1981
Persistent link: https://www.econbiz.de/10002314631
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Increasing productivity through library automation
Helal, Ahmed H. (contributor); Noerr, K. Bivins (contributor) - 1983
Persistent link: https://www.econbiz.de/10002314747
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Future of online catalogues : Essen Symposium, 30 Sept. - 3 Oct. 1985
Helal, Ahmed H.; Weiss, Joachim W.; Bivins Noerr, Kathleen - 1986
Persistent link: https://www.econbiz.de/10013450924
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New trends in electronic publishing and electronic libraries : Essen Symposium, 29 August - 31 August 1983
Helal, Ahmed Helmi (ed.); Weiss, Joachim W. (contributor) - 1984
Persistent link: https://www.econbiz.de/10014003455