Some properties of the complement of the zero-divisor graph of a commutative ring. (English)
ISRN Algebra 2011, Article ID 591041, 24 p. (2011).
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Chromatic roots of a ring of four cliques. (English)
Electron. J. Comb. 18, No. 1, Research Paper P151, 13 p., electronic only (2011).
2