@article{PORMA_1995__52_4_47424,
     author = {Cerdeira, J.Orestes and Barcia, Paulo},
     title = {When is a 0-1 knapsack a matroid?},
     journal = {Portugaliae mathematica},
     pages = {475--480},
     publisher = {mathdoc},
     volume = {52},
     number = {4},
     year = {1995},
     zbl = {0839.90077},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/PORMA_1995__52_4_47424/}
}