Fractal Instances of the Traveling Salesman Problem
Contains resources on the evolving field of the generation of instances of combinatorial optimization problems with known optimal solution.
www.ing.unlp.edu.ar/cetad/mos/FRACTAL_TSP_home.html
TSPBIB Home Page
Listing of papers, source code, preprints, technical reports, etc, available on the Internet about the Traveling Salesman Problem.
www.ing.unlp.edu.ar/cetad/mos/TSPBIB_home.html