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Yaroslav Shitov, Counterexamples to Hedetniemi's conjecture, Annals of Mathematics, Vol. 190, No. 2 (September 2019), pp. 663-667 ...
D. CVETKOVIĆ, M. LEPOVIĆ, SEEKING COUNTEREXAMPLES TO THE RECONSTRUCTION CONJECTURE FOR THE CHARACTERISTIC POLYNOMIAL OF GRAPHS AND A POSITIVE RESULT, Bulletin (Académie serbe des sciences et des arts.
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