@article{MASLO_1985__35_3_a3,
     author = {Korec, Ivan},
     title = {Disjoint covering systems and product-invariant relations},
     journal = {Mathematica slovaca},
     pages = {233--237},
     publisher = {mathdoc},
     volume = {35},
     number = {3},
     year = {1985},
     mrnumber = {808357},
     zbl = {0588.10065},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/MASLO_1985__35_3_a3/}
}