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@Article{PhysRevSTPER.3.020101,
  title = {Elements of a cognitive model of physics problem solving: Epistemic games},
  author = {Tuminaro, Jonathan  and Redish, Edward F.},
  journal = {Phys. Rev. ST Phys. Educ. Res.},
  volume = {3},
  number = {2},
  pages = {020101},
  numpages = {22},
  year = {2007},
  month = {Jul},
  doi = {10.1103/PhysRevSTPER.3.020101},
  publisher = {American Physical Society}
}