@article{10_4064_cm_7_1_61_65,
     author = {Z. Ciesielski and Julian Musielak},
     title = {On absolute convergence of {Haar} series},
     journal = {Colloquium Mathematicum},
     pages = {61--65},
     year = {1959},
     volume = {7},
     number = {1},
     doi = {10.4064/cm-7-1-61-65},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/cm-7-1-61-65/}
}