@article {IOPORT.50244261,
    author       = {Erdogan, G\"unes and Battarra, Maria and Laporte, Gilbert and Vigo, Daniele},
    title        = {Metaheuristics for the traveling salesman problem with pickups, deliveries and handling costs},
    year         = {2012},
    journal      = {Computers & OR},
    volume       = {39},
    number       = {5},
    pages        = {1074-1086},
    doi          = {10.1016/j.cor.2011.07.013},
    identifier   = {50244261},
}