@article{PORMA_1967__26_4_115048,
     author = {Henney, Dagmar R.},
     title = {The structure of set-valued additive functions},
     journal = {Portugaliae mathematica},
     pages = {463--471},
     publisher = {mathdoc},
     volume = {26},
     number = {4},
     year = {1967},
     mrnumber = {0254625},
     zbl = {0198.19301},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/PORMA_1967__26_4_115048/}
}