1. Full abstraction for series-parallel pomsets;Aceto,1991
2. Towards action refinement in process algebras;Aceto;Inform. and Comput.,1993
3. Varieties of ordered algebras;Bloom;J. Comput. System Sci.,1976
4. Free shuffle algebras in language varieties: extended abstract;Bloom,1995
5. Nonfinite axiomatizability of shuffle inequalities;Bloom,1995