@article{RCM_1981__15_181706,
     author = {Xavier Caicedo and W.D. Burgess},
     title = {Congruences {In} {Regular} {Categories.}},
     journal = {Revista colombiana de matematicas},
     pages = {43--64},
     publisher = {mathdoc},
     volume = {15},
     year = {1981},
     zbl = {0474.18005},
     url = {http://geodesic.mathdoc.fr/item/RCM_1981__15_181706/}
}