The Mathieu group M12 and its pseudogroup extension M13.
Conway, John H. ; Elkies, Noam D. ; Martin, Jeremy L.
Experimental Mathematics, Tome 15 (2006), p. 223-236 / Harvested from The Electronic Library of Mathematics
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Publié le : 2006-01-01
DOI : https://doi.org/10.1080/10586458.2006.10128958
EUDML-ID : urn:eudml:doc:231908 
@article{05136952,
     title = {The Mathieu group },
     journal = {Experimental Mathematics},
     volume = {15},
     year = {2006},
     pages = {223-236},
     doi = {10.1080/10586458.2006.10128958},
     zbl = {1112.20003},
     language = {en},
     url = {http://dml.mathdoc.fr/item/05136952}
}

Conway, John H.; Elkies, Noam D.; Martin, Jeremy L. The Mathieu group . Experimental Mathematics, Tome 15 (2006) pp. 223-236. doi : 10.1080/10586458.2006.10128958. http://gdmltest.u-ga.fr/item/05136952/