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2. “General Topology,” Part 2;Bourbaki,1966
3. Zu den Grundlagen einer Theorie topologischer sequentieller Systeme und Automaten;Brauer,1970
4. Stochastische Automaten;Claus,1971
5. Optimal strategies in measurable learning systems on metric spaces;Doberkat;J. Appl. Probability,1977