@article{04127293, title = {On the natural density of the range of the terminating nines function.}, journal = {International Journal of Mathematics and Mathematical Sciences}, volume = {12}, year = {1989}, pages = {805-808}, doi = {10.1155/S0161171289000992}, zbl = {0688.10006}, language = {en}, url = {http://dml.mathdoc.fr/item/04127293} }
Kennedy, Robert K.; Cooper, Curtis N.; Drobot, Vladimir; Hickling, Fred. On the natural density of the range of the terminating nines function.. International Journal of Mathematics and Mathematical Sciences, Tome 12 (1989) pp. 805-808. doi : 10.1155/S0161171289000992. http://gdmltest.u-ga.fr/item/04127293/