Greibach's theorem (English Wikipedia)

Analysis of information sources in references of the Wikipedia article "Greibach's theorem" in English language version.

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archive.org

Sheila Greibach (1963). "The undecidability of the ambiguity problem for minimal linear grammars". Information and Control. 6 (2): 117–125. doi:10.1016/s0019-9958(63)90149-9.
Sheila Greibach (1968). "A note on undecidable properties of formal languages". Math Systems Theory. 2 (1): 1–6. doi:10.1007/bf01691341. S2CID 19948229.

Sheila Greibach (1968). "A note on undecidable properties of formal languages". Math Systems Theory. 2 (1): 1–6. doi:10.1007/bf01691341. S2CID 19948229.