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@article{MS2_1976__38_166465, author = {Dag Normann}, title = {Martin's axiom and medial functions.}, journal = {Mathematica Scandinavica}, pages = {167--176}, publisher = {mathdoc}, volume = {38}, year = {1976}, zbl = {0324.04003}, url = {http://geodesic.mathdoc.fr/item/MS2_1976__38_166465/} }
Dag Normann. Martin's axiom and medial functions.. Mathematica Scandinavica, Tome 38 (1976), pp. 167-176. http://geodesic.mathdoc.fr/item/MS2_1976__38_166465/