@article{TAC_2015_30_a7,
     author = {Michael Barr and John F. Kennison and R. Raphael},
     title = {Limit closures of classes of commutative rings},
     journal = {Theory and applications of categories},
     pages = {229--304},
     year = {2015},
     volume = {30},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/TAC_2015_30_a7/}
}