@article{TAC_2001_8_a15,
     author = {Gunther Richter and Walter Tholen},
     title = {Perfect {Maps} are {Exponentiable} - {Categorically}},
     journal = {Theory and applications of categories},
     pages = {457--464},
     year = {2001},
     volume = {8},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/TAC_2001_8_a15/}
}