@article{TAC_2007_19_a0,
     author = {Susan Niefield},
     title = {Exponentiability in homotopy slices of {Top} and pseudo-slices of {
Cat}},
     journal = {Theory and applications of categories},
     pages = {4--18},
     publisher = {mathdoc},
     volume = {19},
     year = {2007},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/TAC_2007_19_a0/}
}