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@Article{PhysRevSTAB.7.090701,
  title = {Comparison of two superconducting elliptical undulators for generating circularly polarized light},
  author = {Hwang, C. S. and Lin, P. H.},
  journal = {Phys. Rev. ST Accel. Beams},
  volume = {7},
  number = {9},
  pages = {090701},
  numpages = {8},
  year = {2004},
  month = {Sep},
  doi = {10.1103/PhysRevSTAB.7.090701},
  publisher = {American Physical Society}
}