@article{10_4064_cm_16_1_225_229,
     author = {S. Hartman and S. Rolewicz and C. Ryll-Nardzewski},
     title = {Ultra-Kroneckerian sets},
     journal = {Colloquium Mathematicum},
     pages = {225--229},
     publisher = {mathdoc},
     volume = {16},
     number = {1},
     year = {1967},
     doi = {10.4064/cm-16-1-225-229},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/cm-16-1-225-229/}
}