@article{10_21136_CMJ_1983_101850,
     author = {Je\v{z}ek, Jaroslav and Kepka, Tom\'a\v{s}},
     title = {Torsion groupoids},
     journal = {Czechoslovak Mathematical Journal},
     pages = {7--26},
     publisher = {mathdoc},
     volume = {33},
     number = {1},
     year = {1983},
     doi = {10.21136/CMJ.1983.101850},
     mrnumber = {687412},
     zbl = {0525.20041},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.21136/CMJ.1983.101850/}
}