Voir la notice de l'article provenant de la source European Digital Mathematics Library
@article{MS2_1998__81_2_167435, author = {M.J. Tomkinson}, title = {Groups as the union of proper subgroups.}, journal = {Mathematica Scandinavica}, pages = {191--198}, publisher = {mathdoc}, volume = {81}, number = {2}, year = {1998}, zbl = {0905.20014}, url = {http://geodesic.mathdoc.fr/item/MS2_1998__81_2_167435/} }
M.J. Tomkinson. Groups as the union of proper subgroups.. Mathematica Scandinavica, Tome 81 (1998) no. 2, pp. 191-198. http://geodesic.mathdoc.fr/item/MS2_1998__81_2_167435/