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2. Grammars with partial ordering of the rules;Friš;Information and Control,1968
3. Control sets on grammars;Ginsburg;Math. Systems Theory,1968
4. Programmed grammars and classes of formal languages;Rosenkrantz;J. Assoc. Comput. Mach.,1969
5. On finite automata with a time-variant structure;Salomaa;Information and Control,1968