By Aleksenko Alena   Lakshtanov Evgeny   in Kybernetes: The International Journal of Systems & Cybernetics

ISSN:0368-492X|40|9-10|1523-1529

Emerald Group Publishing Ltd‎(2011)‎

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By Lakshtanov Evgeny   Roshchina Vera   in American Mathematical Monthly

ISSN:1930-0972|119|4|318-323

Mathematical Association of America‎(2012)‎

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