@article{blet_mathematical_puzzle_2002,
  author    = {F. {Rodriguez Villegas} and L. Sadun and F. Voloch},
  title     = {Blet: A mathematical puzzle},
  journal   = {Amer. Math. Monthly},
  year      = {2002},
  volume    = {109},
  number    = {8},
  pages     = {729--740},
  URL       = {https://frvillegas.github.io/pdf/blet.pdf}

}

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