@article{Diaz-Barrero08a,
  title = {Problem 11385},
  author = {José Luis Díaz-Barrero},
  year = {2008},
  url = {http://www.jstor.org/stable/27642590},
  researchr = {https://researchr.org/publication/Diaz-Barrero08a},
  cites = {0},
  citedby = {0},
  journal = {The American Mathematical Monthly},
  volume = {115},
  number = {8},
  pages = {757},
}