ScienceDirect can notify a researcher each time one of his articles is cited in another published work, a big ego-boost for scientists.

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But even a premium service can be cost-effective: A university using ScienceDirect, for instance, could save perhaps two-thirds of what a paper-journal subscription would cost.

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Derk Haank , the science division's Amsterdam-based boss, spends an hour at a blackboard showing the company's ScienceDirect has put so much material at scientists' fingertips that cost-per-page-view has more than halved in the last three years.

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