@article{PORMA_1961__20_1_114845,
     author = {Guy, Douglas L.},
     title = {Common extensions of finitely additive probability measures},
     journal = {Portugaliae mathematica},
     pages = {1--5},
     publisher = {mathdoc},
     volume = {20},
     number = {1},
     year = {1961},
     zbl = {0113.11902},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/PORMA_1961__20_1_114845/}
}