@article{MZ_1972__125_171702,
     author = {Wilbur J\'onsson},
     title = {On the {Mathieu} {Groups} {M22,} {M23,} {M24} and the {Uniqueness} of the {Associated} {Steiner} {Systems.}},
     journal = {Mathematische Zeitschrift},
     pages = {193--214},
     publisher = {mathdoc},
     volume = {125},
     year = {1972},
     url = {http://geodesic.mathdoc.fr/item/MZ_1972__125_171702/}
}