A new chromatic quasisymmetric invariant for directed signed graphs and an algebra SQSym of signed quasisymmetric functions are defined and studied.
Chow, Noncommutative symmetric functions of type B Doctoral dissertation, Massachusetts Institute of Technology, 2001
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Chromatic quasisymmetric functions for signed graphs
A new chromatic quasisymmetric invariant for directed signed graphs and an algebra SQSym of signed quasisymmetric functions are defined and studied.