@article{PORMA_1990__47_2_115709,
     author = {Fukuda, Komei and Tamura, Akihisa},
     title = {Dualities in signed vector systems},
     journal = {Portugaliae mathematica},
     pages = {151--165},
     publisher = {mathdoc},
     volume = {47},
     number = {2},
     year = {1990},
     mrnumber = {1090067},
     zbl = {0739.05022},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/PORMA_1990__47_2_115709/}
}