@article{CMUC_1967__8_4_a10,
     author = {Sichler, Ji\v{r}{\'\i}},
     title = {Category of commutative groupoids is binding},
     journal = {Commentationes Mathematicae Universitatis Carolinae},
     pages = {753--755},
     publisher = {mathdoc},
     volume = {08},
     number = {4},
     year = {1967},
     mrnumber = {0228400},
     zbl = {0168.26703},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/CMUC_1967__8_4_a10/}
}