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@article{JRAM_1979__310_152160, author = {Anne L. Ludington}, title = {A bound on {Kaprekar} constants.}, journal = {Journal f\"ur die reine und angewandte Mathematik}, pages = {196--203}, publisher = {mathdoc}, volume = {310}, year = {1979}, zbl = {0409.10005}, url = {http://geodesic.mathdoc.fr/item/JRAM_1979__310_152160/} }
Anne L. Ludington. A bound on Kaprekar constants.. Journal für die reine und angewandte Mathematik, Tome 310 (1979), pp. 196-203. http://geodesic.mathdoc.fr/item/JRAM_1979__310_152160/