@article{TAC_2012_26_a11,
     author = {Valdis Laan},
     title = {Congruences of {Morita} equivalent small categories},
     journal = {Theory and applications of categories},
     pages = {331--337},
     publisher = {mathdoc},
     volume = {26},
     year = {2012},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/TAC_2012_26_a11/}
}