"N, V, Z(MSM 262200012)" . . "The notion of a context-free grammar over a free group is introduced. The transformation of any type-0 grammar to an equivalent context-free grammar over a free group is demonstrated. This approach causes an undesirable increase of the number of nonterminal symbols. Hence we introduce a method for their reduction." . . "2"^^ . "How to Generate Recursively Enumerable Languages Using Only Context-free Productions and Eight Nonterminals" . "Context-Free Grammars, Derivations, Free Groups, Recursively Enumerable Languages"@en . "2005-04-28+02:00"^^ . . "Blatn\u00FD, Petr" . . "2"^^ . . . . . "80-214-2890-2" . . . "How to Generate Recursively Enumerable Languages Using Only Context-free Productions and Eight Nonterminals" . "The notion of a context-free grammar over a free group is introduced. The transformation of any type-0 grammar to an equivalent context-free grammar over a free group is demonstrated. This approach causes an undesirable increase of the number of nonterminal symbols. Hence we introduce a method for their reduction."@en . . . . . "6"^^ . "How to Generate Recursively Enumerable Languages Using Only Context-free Productions and Eight Nonterminals"@en . "Proceedings of 11th Conference and Competition Student EEICT 2005, Volume 3" . "Vysok\u00E9 u\u010Den\u00ED technick\u00E9 v Brn\u011B. Fakulta elektrotechniky a komunika\u010Dn\u00EDch technologi\u00ED" . . "RIV/00216305:26230/05:PU58396!RIV11-MSM-26230___" . "RIV/00216305:26230/05:PU58396" . . "[EDF268AE1537]" . "Brno" . . "26230" . "Brno" . "Bidlo, Radek" . "How to Generate Recursively Enumerable Languages Using Only Context-free Productions and Eight Nonterminals"@en . . . . "523800" .