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[1] M.R. Garrcy, D. S. Johnson: Computers and Intractability - A Guide to the Theory of NP-Completeness. Freeman and Co., San Francisco 1979. MR 0519066
[2] O. Štěpánková: An introduction to qualitative reasoning. In: Advanced Topics in Artificial Intelligence (V. Mařík, O. Štěpánková, and J. Trappl, eds.), (Lecture Notes in Artificial Intelligence 617), Springer Verlag 1992, pp. 404-418.
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