@article{Tan99,
  title = {Edge Guards in Straight Walkable Polygons},
  author = {Xuehou Tan},
  year = {1999},
  researchr = {https://researchr.org/publication/Tan99},
  cites = {0},
  citedby = {0},
  journal = {Int. J. Comput. Geometry Appl.},
  volume = {9},
  number = {1},
  pages = {63},
}