1. Non deterministic recursive program schemes;Arnold,1977
2. A. Arnold and M. Nivat, Algebraic semantics of non deterministic recursive program schemes, Math. Systems Theory, to appear.
3. Interpretations métriques de schémas de programme;Arnold;Proc. 1er Colloque AFCET-SMF de Mathématiques appliquées,1978
4. The metric space of infinite trees. Algebraic and topological properties;Arnold;Rapport IRIA-Laboria No. 323,1978
5. Algebraic families of interpretations;Courcelle;Proc. 17th Symposium on Foundations of Computer Science,1976