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@Article{PhysRevSTPER.3.020107,
  title = {Applying clustering to statistical analysis of student reasoning about two-dimensional kinematics},
  author = {Springuel, R. Padraic and Wittmann, Michael C. and Thompson, John R.},
  journal = {Phys. Rev. ST Phys. Educ. Res.},
  volume = {3},
  number = {2},
  pages = {020107},
  numpages = {8},
  year = {2007},
  month = {Dec},
  doi = {10.1103/PhysRevSTPER.3.020107},
  publisher = {American Physical Society}
}