@article{10_21136_CMJ_1958_100275,
     author = {\v{S}ik, Franti\v{s}ek},
     title = {\"Uber {Summen} einfach geordneter {Gruppen}},
     journal = {Czechoslovak Mathematical Journal},
     pages = {22--53},
     publisher = {mathdoc},
     volume = {08},
     number = {1},
     year = {1958},
     doi = {10.21136/CMJ.1958.100275},
     mrnumber = {0099370},
     zbl = {0198.05101},
     language = {ge},
     url = {http://geodesic.mathdoc.fr/articles/10.21136/CMJ.1958.100275/}
}