MATH  D.L. Applegate, R.E. Bixby, V. Chvátal, and W.J. Cook. The traveling salesman problem: A computational study . Princeton University Press, Princeton, 0000. MATH  T.M.U. Araújo, L.M.M.S. Andrade, C. Magno, L.A.F. Cabral, R.Q. Nascimento, and C.N. Meneses. DC-GRASP: Directing the search on continuous-GRASP. Journal of Heuristics