W
[WD04] Michael Wooldridge and Paul E. Dunne. On the Computational Complexity of Qualitative Coalition Games. Artificial Intelligence 158(1):27-73. Elsevier, September 2004. 
@article{ai158(1)-WD,
  author =              {Wooldridge, Michael and Dunne, Paul E.},
  title =               {On the Computational Complexity of Qualitative
                         Coalition Games},
  publisher =           {Elsevier},
  journal =             {Artificial Intelligence},
  volume =              {158},
  number =              {1},
  pages =               {27-73},
  year =                {2004},
  month =               sep,
  doi =                 {10.1016/j.artint.2004.04.002},
}
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