Towards a theory of relativizations: Positive relativizations -- Natural semantics -- On local routing of two-terminal nets -- Geometric relations among Voronoi diagrams -- Finding the largest empty rectangle on a grated surface -- Efficient graph algorithms using limited communication on a fixed-size array of processors -- On selecting the largest element in spite of erroneous information -- The correlation between the complexities of the non-hierarchical and hierarchical versions of graph problems -- Graph isomorphism is in the low hierarchy -- A hierarchy theorem for almost everywhere complex sets with application to polynomial complexity degrees -- Self-reducibility -- Probability one separation of the Boolean hierarchy -- Reversal complexity of multicounter and multihead machines -- Computing the counting function of context-free languages -- On the k-freeness of morphisms on free monoids -- Avoidable patterns on 2 letters -- Polynomial operations on rational languages -- Some structural aspects of hypergraph languages generated by hyperedge replacement -- Specification and implementation of concurrently accessed data structures: An abstract data type approach -- On implementations of loose abstract data type specifications and their vertical composition -- Are homomorphisms sufficient for behavioural implementations of deterministic and nondeterministic data types? -- Some remarks on presentations by finite Church-Rosser Thue systems -- Ground term confluence in parametric conditional equational specifications -- Describing semantic domains with sprouts -- Comparing direct and continuation semantics styles for concurrent languages -- Expressibility of first order logic with a nondeterministic inductive operator -- Bounded nondeterminism and the approximation induction principle in process algebra -- The step failure semantics -- On the complexity of containment, equivalence, and reachability for finite and 2-dimensional vector addition systems with states -- Closure properties of deterministic Petri nets -- Some results on fairness: The regular case -- Decidability questions for fairness in Petri nets -- Optimal sorting on multi-dimensionally mesh-connected computers -- On the contact-minimization-problem -- Making distributed spanning tree algorithms fault-resilient -- The derivation of on-the-fly garbage collection algorithms from distributed termination detection protocols -- On the expected complexity of distributed selection -- LPG: A generic, logic and functional programming language -- CEC -- ASSPEGIQUE -- REVEUR4 : A laboratory for conditional rewriting -- An interactive, incremental and portable computer algebra system for ?-calculus and combinatory logic based on video edition and rewriting techniques -- The Passau RAP System: Rapid prototyping for algebraic specifications -- SPRAC: A software engineering environment -- SLOG: A logic interpreter for equational clauses -- An algebraic transformation system for occam programs -- REVE a rewrite rule laboratory.