TY  - JOUR
AU  - Almeida, Jorge
AU  - Klima, Ondrej
TI  - New decidable upper bound of the second level in the Straubing-Therien concatenation hierarchy of star-free languages
JO  - Discrete mathematics & theoretical computer science
PY  - 2010
VL  - 12
IS  - 4
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/articles/10.46298/dmtcs.490/
DO  - 10.46298/dmtcs.490
LA  - en
ID  - DMTCS_2010_12_4_a0
ER  -