1. Concorde: a code for solving traveling salesman problems;Applegate,1999
2. An effective implementation of the Lin–Kernighan traveling salesman heuristic
3. On the nearest neighbor algorithms for the traveling salesman problem, Advances in Computational Science, Engineering and;Kizilates,2013
4. Fast Algorithms for Geometric Traveling Salesman Problems, ORSA;Bentley;Journal on Computing,1992