@article{TAC_1999_6_a7,
     author = {Robert Raphael},
     title = {Epimorphic regular contexts},
     journal = {Theory and applications of categories},
     pages = {94--104},
     year = {1999},
     volume = {6},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/TAC_1999_6_a7/}
}