1. Some questions of phrase structure grammars I;Ábráham;Comput. Linguistics,1965
2. The concept of finite representability;Altman,1964
3. Some problems of finite representability;Altman;Inform. Control,1965
4. Phrase\3-structure languages, finite machines and channel capacity;Banerji;Inform. Control,1963
5. Time\3-bounded grammars and their languages;Book;J. Comput. System Sci.,1971