@article{10_21136_CMJ_1974_101278,
     author = {Porubsk\'y, \v{S}tefan},
     title = {Natural exactly covering systems of congruences},
     journal = {Czechoslovak Mathematical Journal},
     pages = {598--606},
     publisher = {mathdoc},
     volume = {24},
     number = {4},
     year = {1974},
     doi = {10.21136/CMJ.1974.101278},
     mrnumber = {0354520},
     zbl = {0327.10005},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.21136/CMJ.1974.101278/}
}