M
[MS12] Carol A. Meyers and Andreas S. Schulz. The complexity of welfare maximization in congestion games. Networks 59(2):252-260. John Wiley & Sons, March 2012. 
@article{netw59(2)-MS,
  author =              {Meyers, Carol A. and Schulz, Andreas S.},
  title =               {The~complexity of welfare maximization in congestion
                         games},
  publisher =           {John Wiley \& Sons},
  journal =             {Networks},
  volume =              {59},
  number =              {2},
  pages =               {252-260},
  year =                {2012},
  month =               mar,
  doi =                 {10.1002/net.20439},
}
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