@article{TAC_1997_3_a8,
     author = {G. M. Kelly and Stephen Lack},
     title = {On property-like structures},
     journal = {Theory and applications of categories},
     pages = {213--250},
     year = {1997},
     volume = {3},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/TAC_1997_3_a8/}
}