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@Article{PhysRevSTPER.4.010109,
  title = {Mathematical learning models that depend on prior knowledge and instructional strategies},
  author = {Pritchard, David E. and Lee, Young-Jin  and Bao, Lei },
  journal = {Phys. Rev. ST Phys. Educ. Res.},
  volume = {4},
  number = {1},
  pages = {010109},
  numpages = {8},
  year = {2008},
  month = {May},
  doi = {10.1103/PhysRevSTPER.4.010109},
  publisher = {American Physical Society}
}