@Article{SCI:She2002a,
  author =    "S. Shellman and K. Sikorski",
  title =     "A Two Dimensional Bisection-Envelope Algorithm for
              Fixed Points",
  journal =   "Journal of Complexity",
  volume =    "18",
  number =    "2",
  pages =     "641--659",
  year =      "2002",
  month =     "June",
  url =       "http://www.sci.utah.edu/publications/She2002a/2002_Shellman_Sikorski_Bisection-Envelope_Algorithm_for_Fixed_Points.pdf",
}