@inproceedings{GKP95,
  title = "An approximation scheme for planar graph {TSP}",
  author = "M. Grigni and E. Koutsoupias and C. Papadimitriou",
  year = "1995",
  address = "Milwaukee, Wisconsin",
  booktitle = "Proceedings of the 36th Annual Symposium on Foundations of Computer Science",
  month = "23--25 oct",
  pages = "640--645",
}