@article{10_4064_cm_2_1_7_8,
     author = {Henry Helson},
     title = {On a problem of {Sikorski}},
     journal = {Colloquium Mathematicum},
     pages = {7--8},
     publisher = {mathdoc},
     volume = {2},
     number = {1},
     year = {1949},
     doi = {10.4064/cm-2-1-7-8},
     language = {pl},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/cm-2-1-7-8/}
}