Hartmanis, J.; Hopcroft, J. E. What makes some language theory problems undecidable. (Russian) Zbl 0231.68031 Kibern. Sb., Nov. Ser. 8, 232-243 (1971). Page: −5 −4 −3 −2 −1 ±0 +1 +2 +3 +4 +5 Show Scanned Page Cited in 2 Documents MSC: 68Q45 Formal languages and automata Citations:Zbl 0198.030 PDFBibTeX XMLCite \textit{J. Hartmanis} and \textit{J. E. Hopcroft}, Kibern. Sb., Nov. Ser. 8, 232--243 (1971; Zbl 0231.68031)