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Sullivan, M.V.; Borgman, C.L.; Wippern, D.: End-users, mediated searches, and front-end assistance programs on dialig : a comparison of learning, performance, and satisfaction (1990) 1.00
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Sullivan, M.V.; Borgman, C.L.: Bibliographic searching by end-users and intermediaries : front-end software vs native DIALOG commands (1988) 1.00
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