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Lecture Notes in Computer Science > ICDT '88 > 322-337
Fundamenta Informaticae > 2009 > Vol. 93, nr 1-3 > 97-110
Journal of Intelligent Manufacturing > 1997 > 8 > 1 > 15-29
IEEE Transactions on Electronic Computers > 1967 > EC-16 > 5 > 670 - 671