@article{SMJ2_2006_32_2-3_a7,
     author = {Zhang, Jiping},
     title = {Finite {Groups} as the {Union} of {Proper} {Subgroups}},
     journal = {Serdica Mathematical Journal},
     pages = {259--268},
     publisher = {mathdoc},
     volume = {32},
     number = {2-3},
     year = {2006},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SMJ2_2006_32_2-3_a7/}
}