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@Article{PhysRevSTPER.3.020108,
  title = {Phenomenographic study of students\char39{} problem solving approaches in physics},
  author = {Walsh, Laura N. and Howard, Robert G. and Bowe, Brian },
  journal = {Phys. Rev. ST Phys. Educ. Res.},
  volume = {3},
  number = {2},
  pages = {020108},
  numpages = {12},
  year = {2007},
  month = {Dec},
  doi = {10.1103/PhysRevSTPER.3.020108},
  publisher = {American Physical Society}
}