The information brokers: How to start and operate your own free-based service: Kelly Warnken, Bowker, New York, (1981) (Information Management Series/2), ISBN 0-8352-1347-1, 154pp. $24.95.
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论文评审过程：Available online 13 July 2002.
论文官网地址：https://doi.org/10.1016/0306-4573(82)90006-1
