@article{FORUM_1994__6_3_141754,
     author = {Anthony W. Hager and Jorge Martinez},
     title = {Functorial rings of quotients 2: the ring of hyper-fractions.},
     journal = {Forum mathematicum},
     pages = {597--616},
     publisher = {mathdoc},
     volume = {6},
     number = {3},
     year = {1994},
     zbl = {0804.18002},
     url = {http://geodesic.mathdoc.fr/item/FORUM_1994__6_3_141754/}
}