@article{Bacher01a,
  title = {Problem 10891},
  author = {Roland Bacher},
  year = {2001},
  url = {http://www.jstor.org/stable/2695281},
  researchr = {https://researchr.org/publication/Bacher01a},
  cites = {0},
  citedby = {0},
  journal = {The American Mathematical Monthly},
  volume = {108},
  number = {7},
  pages = {668},
}