@article{10_4064_cm_81_1_1_4,
     author = {K. Bhaskara Rao and R. Shortt},
     title = {On systems of null sets},
     journal = {Colloquium Mathematicum},
     pages = {1--4},
     publisher = {mathdoc},
     volume = {81},
     number = {1},
     year = {1999},
     doi = {10.4064/cm-81-1-1-4},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/cm-81-1-1-4/}
}