@article{Mann04-1,
  title = {Heesch's Tiling Problem},
  author = {Casey Mann},
  year = {2004},
  url = {http://www.jstor.org/stable/4145069},
  researchr = {https://researchr.org/publication/Mann04-1},
  cites = {0},
  citedby = {0},
  journal = {The American Mathematical Monthly},
  volume = {111},
  number = {6},
  pages = {509-517},
}