@article{AUCMP_1971__12_1_a3,
     author = {Kepka, Tom\'a\v{s}},
     title = {Regular mappings of groupoids},
     journal = {Acta Universitatis Carolinae. Mathematica et Physica},
     pages = {25--37},
     publisher = {mathdoc},
     volume = {12},
     number = {1},
     year = {1971},
     zbl = {0254.20053},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/AUCMP_1971__12_1_a3/}
}