@article{TAC_2008_20_a14,
     author = {Michael Barr and John F. Kennison and R. Raphael},
     title = {Isbell duality},
     journal = {Theory and applications of categories},
     pages = {504--542},
     publisher = {mathdoc},
     volume = {20},
     year = {2008},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/TAC_2008_20_a14/}
}