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Geyser, E.P.; Brakel, P.A. van: Man-machine interaction as a factor in the design of computerised information retrieval systems (1991) 1.00
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Geyser, E.P.: Human factors in the interaction process between man and the user friendly information retrieval system (1992) 1.00
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Geyser, E.P.: ¬A model for the evaluation of an information retrieval system in terms of user friedliness (1993) 1.00
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