@article{Callan02a,
  title = {Problem 10952},
  author = {David Callan},
  year = {2002},
  url = {http://www.jstor.org/stable/2695451},
  researchr = {https://researchr.org/publication/Callan02a},
  cites = {0},
  citedby = {0},
  journal = {The American Mathematical Monthly},
  volume = {109},
  number = {6},
  pages = {569},
}