By Jacobs D.P.   in Journal of Symbolic Computation

ISSN:0747-7171|23|5|497-502

Academic Press‎(1997)‎

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By Hedetniemi S.M.   Hedetniemi S.T.   Jacobs D.P.   Srimani P.K.   in Computers and Mathematics with Applications

ISSN:0898-1221|46|5|805-811

Elsevier‎(2003)‎

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