@article{JIS_2011__14_1_a4,
     author = {Tang, Chi-Wu and Tang, Min and Wu, Lei},
     title = {Unique difference bases of $\Bbb Z$},
     journal = {Journal of integer sequences},
     publisher = {mathdoc},
     volume = {14},
     number = {1},
     year = {2011},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/JIS_2011__14_1_a4/}
}