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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Derk Haank, the science division's Amsterdam-based boss, spends an hour at a blackboard proving that the company's Sciencedirect.com has put so much material at scientists' fingertips that the cost per page view has been cut by more than half in the past three years.

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