@article{MZ_1974__140_172133,
     author = {Daniel Segal},
     title = {Normal {Subgroups} of {Finitary} {Permutation} {Groups.}},
     journal = {Mathematische Zeitschrift},
     pages = {81--86},
     publisher = {mathdoc},
     volume = {140},
     year = {1974},
     zbl = {0279.20003},
     url = {http://geodesic.mathdoc.fr/item/MZ_1974__140_172133/}
}