Selected papers that cite this one
- Sheila A. Greibach. An infinite hierarchy of context-free languages. Journal of the ACM, 16(1):91-106, January 1969.
Selected references
- Noam Chomsky. On certain formal properties of grammars. Information and Control, 2(2):137-167, June 1959.
- Seymour Ginsburg and G. F. Rose. Operations which preserve definability in languages. Journal of the ACM, 10(2):175-195, April 1963.
- Sheila A. Greibach. The undecidability of the ambiguity problem for minimal linear grammars. Information and Control, 6(2):119-125, June 1963.