The symmetric group of degree six can be covered by 13 and no fewer proper subgroups.
Abdollahi, A. ; Ashraf, F. ; Shaker, S.M.
Bulletin of the Malaysian Mathematical Sciences Society. Second Series, Tome 30 (2007), p. 57-58 / Harvested from The Electronic Library of Mathematics
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Publié le : 2007-01-01
EUDML-ID : urn:eudml:doc:53819 
@article{05235717,
     title = {The symmetric group of degree six can be covered by 13 and no fewer proper subgroups.},
     journal = {Bulletin of the Malaysian Mathematical Sciences Society. Second Series},
     volume = {30},
     year = {2007},
     pages = {57-58},
     zbl = {1132.20002},
     language = {en},
     url = {http://dml.mathdoc.fr/item/05235717}
}

Abdollahi, A.; Ashraf, F.; Shaker, S.M. The symmetric group of degree six can be covered by 13 and no fewer proper subgroups.. Bulletin of the Malaysian Mathematical Sciences Society. Second Series, Tome 30 (2007) pp. 57-58. http://gdmltest.u-ga.fr/item/05235717/