• Nonaxiomatisability of Equivalences over Finite State Processes. Peter Sewell. Annals of Pure and Applied Logic, 90:163--191, December 1997. Invited submission from LICS '94. [ bib | doi | ps | pdf | http | abstract ]
• The Algebra of Finite State Processes. Peter Michael Sewell. PhD thesis, University of Edinburgh, October 1995. Dept. of Computer Science technical report CST-118-95, also published as LFCS-95-328. [ bib | ps (cmr) | ps | pdf | abstract ]
• Bisimulation is Not Finitely (First-Order) Equationally Axiomatisable. Peter M. Sewell. In LICS 1994, Subsumed by the APAL 1997 paper. [ bib | doi | ps | pdf | http | abstract ]