By Anis S.   Mushtaq Q.   in Communications in Algebra

ISSN:0092-7872|36|11|4276-4283

Taylor & Francis Ltd‎(2008)‎

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By Ashiq M.   Mushtaq Q.   Maqsood T.   Aslam M.   in European Journal of Combinatorics

ISSN:0195-6698|22|7|905-909

Elsevier‎(2001)‎

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