@article{05138316, title = {Counting Keith numbers.}, journal = {Journal of Integer Sequences [electronic only]}, volume = {10}, year = {2007}, zbl = {1132.11006}, language = {en}, url = {http://dml.mathdoc.fr/item/05138316} }
Klazar, Martin; Luca, Florian. Counting Keith numbers.. Journal of Integer Sequences [electronic only], Tome 10 (2007) . http://gdmltest.u-ga.fr/item/05138316/