Andreas Björklund, Thore Husfeldt, Sanjeev Khanna. Approximating Longest Directed Paths and Cycles. In Josep Díaz, Juhani Karhumäki, Arto Lepistö, Donald Sannella, editors, Automata, Languages and Programming: 31st International Colloquium, ICALP 2004, Turku, Finland, July 12-16, 2004. Proceedings. Volume 3142 of Lecture Notes in Computer Science, pages 222-233, Springer, 2004. [doi]
Abstract is missing.