Average Citations for Services with High and Low Usability from 2003 to 2009.
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Contrasting the number of citations for services with a high score in usability (2–3) with available, but low-scoring services (see Table 4). On average, a service with high usability is cited 1.8 times more often than a service with low usability is.
创建时间：
2015-12-02
