@article{05019259, title = {Searching for Kaprekar's constants: algorithms and results.}, journal = {International Journal of Mathematics and Mathematical Sciences}, volume = {2005}, year = {2005}, pages = {2999-3004}, doi = {10.1155/IJMMS.2005.2999}, zbl = {1100.11007}, language = {en}, url = {http://dml.mathdoc.fr/item/05019259} }
Walden, Byron L. Searching for Kaprekar's constants: algorithms and results.. International Journal of Mathematics and Mathematical Sciences, Tome 2005 (2005) pp. 2999-3004. doi : 10.1155/IJMMS.2005.2999. http://gdmltest.u-ga.fr/item/05019259/