Nubia Velasco, Philippe Castagliola, Pierre Dejax, Christelle Guéret, Christian Prins. A Memetic Algorithm for a Pick-Up and Delivery Problem by Helicopter. In Francisco Baptista Pereira, Jorge Tavares, editors, Bio-inspired Algorithms for the Vehicle Routing Problem. Volume 161 of Studies in Computational Intelligence, pages 173-190, Springer, 2009. [doi]
Abstract is missing.