Qingyan Du

发表

On sigma-polynomials and a class of chromatically unique graphs

Qingyan Du, 1993, Discret. Math..

On σ-equivalence and χ-equivalence of graphs

Qingyan Du, 1996, J. Graph Theory.

Chromaticity of the complements of paths and cycles

Qingyan Du, 1996, Discret. Math..

On σ-equivalence and k-equivalence of graphs

Qingyan Du, 1996 .