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Complexity and Approximation - http://www.nada.kth.se/~viggo/approxbook/
Combinatorial optimization problems and their approximability properties: by G. Ausiello, P. Crescenzi, G. Gambosi, V. Kann, A. Marchetti-Spaccamela, M. Protasi (Springer, 1999). Table of contents, errata, software supplement and a continuously updated catalog of approximability results. |