An approximation scheme for planar graph TSP
Michelangelo Grigni,
Elias Koutsoupias,
and Christos Papadimitriou
Proc. 36th Symp. Foundations of Computer Science, IEEE, 1995, pp. 640–645
http://daphne.cs.ucla.edu/elias/publications/abstracts.html#gkp95
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