Everyone knows "Garey & Johnson", which is my go-to reference whenever I need a problem to transform from for an NP-hardness proof. However I recently find myself in need of an APX-hardness proof, and I wonder if there is a similar (and more up to date..?) collection of problems that have been shown to be APX-hard.
Does anybody know of anything like this? I find it hard to believe that there is no website systematically collecting such problems, but my Google skills seem to be insufficient.
Ausiello, Giorgio, et al. Complexity and approximation: Combinatorial optimization problems and their approximability properties. Springer Science & Business Media, 2012.
https://www.springer.com/us/book/9783540654315 DOI: 10.1007/978-3-642-58412-1
– Lukas Barth Aug 19 '16 at 12:15