@article{PORMA_1979__38_1-2_115378,
     author = {Veira Martins, Ernesto Q.},
     title = {A dual algorithm for the minimal cost flow problem},
     journal = {Portugaliae mathematica},
     pages = {155--165},
     publisher = {mathdoc},
     volume = {38},
     number = {1-2},
     year = {1979},
     mrnumber = {0682365},
     zbl = {0498.90035},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/PORMA_1979__38_1-2_115378/}
}