@article{PORMA_1951__10_4_114531,
     author = {Suppes, Patrick},
     title = {A set of independent axioms for extensive quantities},
     journal = {Portugaliae mathematica},
     pages = {163--172},
     publisher = {mathdoc},
     volume = {10},
     number = {4},
     year = {1951},
     mrnumber = {0047576},
     zbl = {0044.17102},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/PORMA_1951__10_4_114531/}
}