Bibliography

Cancellation in Context-Free Languages: Enrichment by Reduction.

Matthias Jantzen and Holger Petersen.
Cancellation in context-free languages: Enrichment by reduction.
Theoretical Computer Science, 127(1):149-170, 1994.

BibTeX

@article{Jantzen+94,
 Author = {Jantzen, Matthias and Petersen, Holger},
 Journal = TCS,
 Number = 1,
 Pages = {149--170},
 Title = {Cancellation in Context-Free Languages: Enrichment by Reduction.},
 Volume = 127,
 Year = 1994
}