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@Article{PhysRevSTPER.3.020105,
  title = {Comparing three methods for teaching Newton\char39{}s third law},
  author = {Smith, Trevor I. and Wittmann, Michael C.},
  journal = {Phys. Rev. ST Phys. Educ. Res.},
  volume = {3},
  number = {2},
  pages = {020105},
  numpages = {8},
  year = {2007},
  month = {Oct},
  doi = {10.1103/PhysRevSTPER.3.020105},
  publisher = {American Physical Society}
}