@article{KnightZ03,
  title = {Hidden Arctangents: 10901},
  author = {M. J. Knight and Li Zhou},
  year = {2003},
  url = {http://www.jstor.org/stable/3072359},
  researchr = {https://researchr.org/publication/KnightZ03},
  cites = {0},
  citedby = {0},
  journal = {The American Mathematical Monthly},
  volume = {110},
  number = {1},
  pages = {64},
}