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Patterns of Journal Use by Scientists through Three Evolutionary Phases (10 May 2003)
Older articles tend to be more useful and valuable than recently published articles, and most of the older ones are obtained from library collections.
The evolution of system phases appears not to have affected the age of articles read.
Electronic access to older articles in the advanced (astronomy) system allows readers to obtain the articles at much less cost to them in terms of time.
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