Felipe Ortega, ÁngelOrtuño, M. T.Tirado Domínguez, Gregorio2023-06-202023-06-2020090305-054810.1016/j.cor.2009.01.015https://hdl.handle.net/20.500.14352/49906The double traveling salesman problem with multiple stacks (DTSPMS) is a vehicle routing problem that consists on finding the minimum total length tours in two separated networks, one for pickups and one for deliveries. A set of orders is given, each one consisting of a pickup location and a delivery location, and it is required to send an item from the former location to the latter one. Repacking is not allowed, but collected items can be packed in several rows in such a way that each row must obey the LIFO principle. In this paper, a variable neighborhood search approach using four new neighborhood structures is presented to solve the problem.engjournal articlehttp://www.sciencedirect.com/science/article/pii/S0305054809000288http://www.sciencedirect.comrestricted access519.22Traveling Salesman ProblemVariable Neighborhood SearchLIFO LoadingVehicle-Routing Problem2-Dimensional Loading ConstraintsDeliveryPickupAlgorithmsComputer ScienceInterdisciplinary ApplicationsEngineeringIndustrialOperations Research & Management ScienceEcuaciones diferenciales1202.07 Ecuaciones en Diferencias