OSMAN I H, WASSAN N A. A reactive tabu search meta-heuristic for the vehicle routing problem with backhauls[J]. Journal of Scheduling, 2002, 5（4）:263-285.
[2]
CASCO O, GOLDEN B, WASIL E. Vehicle routing with backhauls: models, algorithms and case studies[A]. Vehicle Routing: Methods and Studies[C]. Amsterdam, North Holland: Elsevier, 1988.127 -147.
