@article{w-eacop-07,
  author    = {Ron Wein},
  title     = {Exact and approximate construction of offset polygons},
  journal   = {Computer-Aided Design},
  volume    = {39},
  number    = {6},
  year      = {2007},
  pages     = {518-527},
  ee        = {http://dx.doi.org/10.1016/j.cad.2007.01.010},
{