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@Article{PhysRevSTPER.4.010104,
  title = {Assessing student expertise in introductory physics with isomorphic problems. I. Performance on nonintuitive problem pair from introductory physics},
  author = {Singh, Chandralekha },
  journal = {Phys. Rev. ST Phys. Educ. Res.},
  volume = {4},
  number = {1},
  pages = {010104},
  numpages = {9},
  year = {2008},
  month = {Mar},
  doi = {10.1103/PhysRevSTPER.4.010104},
  publisher = {American Physical Society}
}