@article{MZ_1982__181_173220,
     author = {Judy Roitman},
     title = {Non-isomorphic {Hyper-real} {Fields} from {Non-isomorphic} {Ultrapowers.}},
     journal = {Mathematische Zeitschrift},
     pages = {93--96},
     publisher = {mathdoc},
     volume = {181},
     year = {1982},
     zbl = {0474.54003},
     url = {http://geodesic.mathdoc.fr/item/MZ_1982__181_173220/}
}