Keppens, Jeroen and Shen, Qiang. 2002. “A Calculus of Partially Ordered Preferences for Compositional Modeling.” in AAAI-02. Preferences in AI and CP: Symbolic Approaches, edited by Ulrich Junker, pp. 39–46. Menlo Park, California: The AAAI Press.
Miguel, Ian and Shen, Qiang. 2003. “Fuzzy rrDFCSP and Planning.”Artificial Intelligence 148(1–2): 11–52.