1. An algorithm for vehicle routing with time window constraints;Baker,1981
2. The shortest path through many points;Beardwood;Proc. Camb. Phil. Soc.,1959
3. The state of the art in the routing and scheduling of vehicles and crews;Bodin,1981
4. The subscriber Dial-A-Ride problem: The Baltimore, Maryland Benchmark;Bodin,1980
5. Worst case analysis of a new heuristic for the travelling salesman problem;Christofides,1976