@article{CMUC_1977__18_2_a5,
     author = {Kepka, Tom\'a\v{s}},
     title = {Epimorphisms in some groupoid varieties},
     journal = {Commentationes Mathematicae Universitatis Carolinae},
     pages = {265--279},
     publisher = {mathdoc},
     volume = {18},
     number = {2},
     year = {1977},
     mrnumber = {0439714},
     zbl = {0357.08002},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/CMUC_1977__18_2_a5/}
}