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Furtado, M.G.S.; Munari, P.; Morabito, R.
Pickup and delivery problem with time windows: a new compact two-index formulation.
Operations Research Letters, v. 45 (4), p. 334-341, 2017.

Abstract: We propose a formulation for the pickup and delivery problem with time windows, based on a novel modeling strategy that allows the assignment of vehicles to routes explicitly in two-index flow formulations. It leads to an effective compact formulation that can benefit OR practitioners interested in solving the problem by general-purpose optimization software. Computational experiments indicate that the proposed formulation has interesting features and best overall performance in relation to other compact formulations.

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