Operators and Laws for Combining Preference Relations

[AndrekaRyanSchobbens2002] Hajnal Andr'eka, Mark Ryan and Pierre-Yves Schobbens. Operators and Laws for Combining Preference Relations. Journal of Logic and Computation, 12(1), pages 13-53. 2002.
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Available from: ftp://ftp.cs.bham.ac.uk/pub/authors/M.D.Ryan/00-operators.ps.gz