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@Article{PhysRevSTPER.2.020105,
  title = {Using resource graphs to represent conceptual change},
  author = {Wittmann, Michael C.},
  journal = {Phys. Rev. ST Phys. Educ. Res.},
  volume = {2},
  number = {2},
  pages = {020105},
  numpages = {17},
  year = {2006},
  month = {Aug},
  doi = {10.1103/PhysRevSTPER.2.020105},
  publisher = {American Physical Society}
}