info:oai:utas.edu.au:4150info:ofi/fmt:xml:xsd:journalKingRCKing, RCWelshTAWelsh, TAJarvisPDJarvis, PD334017 August 20071751-8113The mixed two-qubit system and the structure of its ring of local invariantsJournal of Physics A: Mathematical and Theoretical10083-10108article