@article{10_4153_CMB_1967_035_0,
     author = {Richman, Fred},
     title = {Maximal {Subgroups} of {Infinite} {Symmetric} {Groups}},
     journal = {Canadian mathematical bulletin},
     pages = {375--381},
     year = {1967},
     volume = {10},
     number = {3},
     doi = {10.4153/CMB-1967-035-0},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CMB-1967-035-0/}
}