@article{JIS_2007__10_4_a0,
     author = {Jones, Lenny},
     title = {Variations on a theme of {Sierpi\'nski}},
     journal = {Journal of integer sequences},
     publisher = {mathdoc},
     volume = {10},
     number = {4},
     year = {2007},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/JIS_2007__10_4_a0/}
}