@article{MZ_1970__117_171428,
     author = {Ulrich Schoenwaelder and Dieter Held},
     title = {A {Characterization} of the {Simple} {Group} {M24.}},
     journal = {Mathematische Zeitschrift},
     pages = {289--308},
     publisher = {mathdoc},
     volume = {117},
     year = {1970},
     zbl = {0209.33003},
     url = {http://geodesic.mathdoc.fr/item/MZ_1970__117_171428/}
}