![](/img/cover-not-exists.png)
A counterexample to a conjecture concerning concatenation hierarchies
Jorge Almeida, Ondřej KlímaVolume:
110
Year:
2009
Language:
english
Pages:
4
DOI:
10.1016/j.ipl.2009.09.011
File:
PDF, 150 KB
english, 2009