@article{701119,
     title = {On Ulam's problem on families of measures},
     booktitle = {Abstracta. 6th Winter School on Abstract Analysis},
     series = {GDML\_Books},
     publisher = {Czechoslovak Academy of Sciences},
     address = {Praha},
     year = {1978},
     pages = {45-48},
     url = {http://dml.mathdoc.fr/item/701119}
}

Grzegorek, E. On Ulam's problem on families of measures, dans Abstracta. 6th Winter School on Abstract Analysis, GDML_Books,  (1978), pp. 45-48. http://gdmltest.u-ga.fr/item/701119/