@article{Trenkler03,
  title = {Problem 11028},
  author = {Götz Trenkler},
  year = {2003},
  url = {http://www.jstor.org/stable/3647752},
  researchr = {https://researchr.org/publication/Trenkler03},
  cites = {0},
  citedby = {0},
  journal = {The American Mathematical Monthly},
  volume = {110},
  number = {7},
  pages = {636},
}