David P. Dobkin, Allan R. Wilks, Silvio V. F. Levy, and William P. Thurston.
"Contour Tracing by Piecewise Linear Approximations."
ACM Transactions on Graphics 9(4):389-423, October 1990.

@article{Dobkin:1990:CTB,
   author = "David P. Dobkin and Allan R. Wilks and Silvio V. F. Levy and William P.
      Thurston",
   title = "Contour Tracing by Piecewise Linear Approximations",
   journal = "ACM Transactions on Graphics",
   year = "1990",
   month = oct,
   volume = "9",
   number = "4",
   pages = "389--423"
}