1. Formal computations of nondeterministic recursive programm schemes;Arnold;Math. Systems Theory,1980
2. The metric space of infinite trees: Algebraic and topological properties;Arnold;Fund. Inform.,1980
3. The temporal logic of branching time;Ben-Ari,1981
4. The minimization of tree automata;Brainerd;Inform. and Control,1968
5. On a decision method in restricted second order arithmetic;Büchi,1960