@article{MS2_1971__28_166182,
     author = {J. Hoffmann-Jorgensen},
     title = {Existence of {Conditional} {Probabilities.}},
     journal = {Mathematica Scandinavica},
     pages = {257--264},
     publisher = {mathdoc},
     volume = {28},
     year = {1971},
     zbl = {0247.60001},
     url = {http://geodesic.mathdoc.fr/item/MS2_1971__28_166182/}
}