@article{10_4064_aa131_4_3,
     author = {G\"unter Lettl and Zhi-Wei Sun},
     title = {On covers of abelian groups by cosets},
     journal = {Acta Arithmetica},
     pages = {341--350},
     year = {2008},
     volume = {131},
     number = {4},
     doi = {10.4064/aa131-4-3},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/aa131-4-3/}
}