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3. Derivation Bounded Languages;Ginsburg;SDC Document TM738/041/00,1968
4. Undecidability of the ambiguity problem for minimal linear grammars;Greibach;Information and Control.,1963
5. Two operations with formal languages and their influence upon structural unambiguity;Gruska;Mat. Časopis Sloven. Akad. Vied.,1966