@article{ARM_1971__7_1_a2,
     author = {Coufal, Old\v{r}ich},
     title = {Contributions to the theory of decompositions on a group},
     journal = {Archivum mathematicum},
     pages = {23--28},
     publisher = {mathdoc},
     volume = {07},
     number = {1},
     year = {1971},
     mrnumber = {0299666},
     zbl = {0239.20042},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/ARM_1971__7_1_a2/}
}