@article{PORMA_1993__50_1_115809,
     author = {Polonijo, M.},
     title = {Transitive groupoids},
     journal = {Portugaliae mathematica},
     pages = {63--74},
     publisher = {mathdoc},
     volume = {50},
     number = {1},
     year = {1993},
     mrnumber = {1300586},
     zbl = {0799.20065},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/PORMA_1993__50_1_115809/}
}