@Misc{mui-2002a,
  author         = {Lik Mui},
  title          = {Towards Realistic Models for Evolution of Cooperation},
  year           = {2002},
  howpublished   = {MIT LCS Memorandum},
  url            = {http://medg.lcs.mit.edu/people/lmui/docs/AreaExam.ppt},
  key            = {mui-2002a}
}