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MathSciNet bibliographic data
MR2160935 68Q17 (05C38 68R10)
Björklund, Andreas; Husfeldt, Thore; Khanna, Sanjeev Approximating longest directed paths and cycles. Automata, languages and programming, 222–233, Lecture Notes in Comput. Sci., 3142, Springer, Berlin, 2004.
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