Observability and Nerode equivalence in concrete categories -- Some universal algebraic and model theoretic results in computer science -- Probabilistic analysis of the performance of greedy strategies over different classes of combinatorial problems -- Moderately exponential bound for graph isomorphism -- An algebraic definition of attributed transformations -- Analogies of PAL and COPY -- Quasi-equational logic for partial algeras -- Homogeneity and completeness -- On the error correcting power of pluralism in inductive inference -- Equality languages and language families -- Extremal combinatorial problems in relational data base -- Specifying algebraic data types by domain equations -- An axiomatization of regular forests in the language of algebraic theories with iteration -- Fast recognition of rings and lattices -- A definition of the P = NP-problem in categories -- Generating graph languages using hypergraph grammars -- Lower bounds for problems defined by polynomial inequalities -- What is computable for abstract data types ? -- On strongly cube-free ?-words generated by binary morphisms -- On the role of selectors in selective substitution grammars -- Classes of functions over binary trees -- Mathematical structures underlying greedy algorithms -- Some properties of language families generated by commutative languages -- Isomorphism completeness for some algebraic structures -- Reducing algebraic tree grammars -- Rational cone and substitution -- On the regularity problem of SF-languages generated by minimal linear grammars -- Co-algebras as machines for the interpretations of flow diagrams -- Random access machines and straight-line programs -- On the LBA problem -- Dynamic algebras of programs -- The equivalence problem for LL- and LR-regular grammars -- Context-free languages of infinite words as least fixpoints -- Remarks on the notion of concurrency relation in the case of systems -- On the size of conjunctive representations of n-ary relations -- On subwords of formal languages -- First order dynamic logic with decidable proofs and workable model theory -- Elimination of second-order quantifiers for well-founded trees in stationary logic and finitely determinate structures -- Processes in Petri nets -- Some algebraic aspects of recognizability and rationality -- Pebbling and bandwidth -- On cellular graph-automata and second-order definable graph-properties -- Extensions of symmetric hom-functors to the Kleisli category -- A new operation between languages -- Logical description of computation processes -- An algorithm to identify slices, with applications to vector replacement systems -- One pebble does not suffice to search plane labyrinths -- About the by codings of environments induced posets [µ z, ?] and [?z, ?] -- The complexity of automata and subtheories of monadic second order arithmetics -- Tape complexity of word problems.