New problem: some diagonal fun

Raymond P. Polivka. New problem: some diagonal fun. ACM SIGAPL APL Quote Quad, 35(4):27, 2007. [doi]

@article{Polivka07b,
  title = {New problem: some diagonal fun},
  author = {Raymond P. Polivka},
  year = {2007},
  doi = {10.1145/1354923.1354928},
  url = {http://doi.acm.org/10.1145/1354923.1354928},
  researchr = {https://researchr.org/publication/Polivka07b},
  cites = {0},
  citedby = {0},
  journal = {ACM SIGAPL APL Quote Quad},
  volume = {35},
  number = {4},
  pages = {27},
}