@article{FORUM_1993__5_3_141716,
     author = {Ulrich Felgner and Frieder Haug},
     title = {The homomorphic images of infinite symmetric groups.},
     journal = {Forum mathematicum},
     pages = {505--520},
     year = {1993},
     volume = {5},
     number = {3},
     zbl = {0791.20003},
     url = {http://geodesic.mathdoc.fr/item/FORUM_1993__5_3_141716/}
}