TY  - JOUR
AU  - Geffert, Viliam
TI  - Normal forms for phrase-structure grammars
JO  - RAIRO - Theoretical Informatics and Applications - Informatique Théorique et Applications
PY  - 1991
SP  - 473
EP  - 496
VL  - 25
IS  - 5
PB  - EDP-Sciences
UR  - http://www.numdam.org/item/ITA_1991__25_5_473_0/
LA  - en
ID  - ITA_1991__25_5_473_0
ER  -