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@Article{PhysRevSTPER.3.020104,
  title = {Analogical scaffolding and the learning of abstract ideas in physics: Empirical studies},
  author = {Podolefsky, Noah S. and Finkelstein, Noah D.},
  journal = {Phys. Rev. ST Phys. Educ. Res.},
  volume = {3},
  number = {2},
  pages = {020104},
  numpages = {16},
  year = {2007},
  month = {Sep},
  doi = {10.1103/PhysRevSTPER.3.020104},
  publisher = {American Physical Society}
}