Wu X., Ichikawa T. KDA: a knowledge-based database assistant with a query guiding facility // IEEE Transactions on Knowledge and Data Engineering.-1992.-v.4.-N 5.-P. 443-453.
Wu X., Ichikawa T. KDA: a knowledge-based database assistant with a query guiding facility // IEEE Transactions on Knowledge and Data Engineering.-1992.-v.4.-N 5.-P. 443–453. 
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