@article{00530106, title = {Construction of the fourfold cover of the Mathieu group }, journal = {Experimental Mathematics}, volume = {2}, year = {1993}, pages = {11-14}, doi = {10.1080/10586458.1993.10504265}, zbl = {0805.20014}, language = {en}, url = {http://dml.mathdoc.fr/item/00530106} }
Suleiman, Ibrahim A.I.; Wilson, Robert A. Construction of the fourfold cover of the Mathieu group . Experimental Mathematics, Tome 2 (1993) pp. 11-14. doi : 10.1080/10586458.1993.10504265. http://gdmltest.u-ga.fr/item/00530106/