Backtrack Programming with SIMULA. - Keld Helsgaun (Comput. J., 1984)

CBack: A Simple Tool for Backtrack Programming in C. - Keld Helsgaun (Softw. Pract. Exp., 1995)

An effective implementation of the Lin-Kernighan traveling salesman heuristic. - Keld Helsgaun (Eur. J. Oper. Res., 2000)

General k-opt submoves for the Lin-Kernighan TSP heuristic. - Keld Helsgaun (Math. Program. Comput., 2009)

Certification of an optimal TSP tour through 85, 900 cities. - David L. Applegate; Robert E. Bixby; Vasek Chvátal; William J. Cook; Daniel G. Espinoza; Marcos Goycoolea; Keld Helsgaun (Oper. Res. Lett., 2009)

Solving the equality generalized traveling salesman problem using the Lin-Kernighan-Helsgaun Algorithm. - Keld Helsgaun (Math. Program. Comput., 2015)

Efficient Recombination in the Lin-Kernighan-Helsgaun Traveling Salesman Heuristic. - Renato Tinós; Keld Helsgaun; L. Darrell Whitley (PPSN (1), 2018)

POPMUSIC for the travelling salesman problem. - Éric D. Taillard; Keld Helsgaun (Eur. J. Oper. Res., 2019)

Constrained Local Search for Last-Mile Routing. - William J. Cook; Stephan Held; Keld Helsgaun (Transp. Sci., 2024)

Local elimination in the traveling salesman problem. - William J. Cook; Keld Helsgaun; Stefan Hougardy; Rasmus T. Schroeder (Math. Program. Comput., 2024)