Guy Desaulniers, Jacques Desrosiers, Andreas Erdmann, Marius M. Solomon, François Soumis. VRP with Pickup and Delivery. In Paolo Toth, Daniele Vigo, editors, The Vehicle Routing Problem. Volume 9 of SIAM monographs on discrete mathematics and applications, pages 225-242, SIAM, 2002. [doi]
Abstract is missing.