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- [1] A Weighted Version of the Jump Number Problem on Two-Dimensional Orders is NP-Complete Order, 2003, 20 : 1 - 11
- [3] Decision Version of the Road Coloring Problem Is NP-Complete FUNDAMENTALS OF COMPUTATION THEORY, PROCEEDINGS, 2009, 5699 : 287 - 297
- [4] CROSSING NUMBER IS NP-COMPLETE SIAM JOURNAL ON ALGEBRAIC AND DISCRETE METHODS, 1983, 4 (03): : 312 - 316
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