1. Specifying communication in distributed information systems

   • Hans-Dieter Ehrich
   • Carlos Caleiro

   Original articles Pages: 591 - 616

2. A complete algebraic characterization of behavioral subtyping

   • Gary T. Leavens
   • Don Pigozzi

   Original articles Pages: 617 - 663

3. On the expressiveness of subset-sum representations

   • Lucian Ilie
   • Arto Salomaa

   Original articles Pages: 665 - 672