@article{MZ_1968__106_171014,
     author = {Christopher W. Norman},
     title = {A {Characterization} of the {Mathieu} {Group} {M11.}},
     journal = {Mathematische Zeitschrift},
     pages = {162--166},
     publisher = {mathdoc},
     volume = {106},
     year = {1968},
     zbl = {0164.33101},
     url = {http://geodesic.mathdoc.fr/item/MZ_1968__106_171014/}
}