TY  - JOUR
AU  - P. Weil
TI  - Some results on the dot-depth  hierarchy.
JO  - Semigroup forum
PY  - 1993
SP  - 352
EP  - 370
VL  - 46
IS  - 1
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/SF_1993__46_1_135242/
ID  - SF_1993__46_1_135242
ER  -