@article{TAC_2002_10_a4,
     author = {Susan Niefield},
     title = {Exponentiability of perfect maps: four approaches},
     journal = {Theory and applications of categories},
     pages = {127--133},
     year = {2002},
     volume = {10},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/TAC_2002_10_a4/}
}