@article{JIS_2005__8_4_a4,
     author = {Iannucci,  Douglas E. and Foster,  Bertrum},
     title = {Kaprekar triples},
     journal = {Journal of integer sequences},
     year = {2005},
     volume = {8},
     number = {4},
     zbl = {1108.11025},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/JIS_2005__8_4_a4/}
}