Magnús Halldórsson
Graph Theory:
Covering and Partitioning,
Subgraphs and Supergraphs,
Sets and Partitions.
Marek Karpinski Graph Theory:
Vertex Ordering,
Network Design:
Cuts and Connectivity.
Gerhard Woeginger
Sequencing and Scheduling.
This compendium
of approximability results for NP optimization problems
was last updated in 2000.