@article{ITA_1991__25_5_473_0, author = {Geffert, Viliam}, title = {Normal forms for phrase-structure grammars}, journal = {RAIRO - Theoretical Informatics and Applications - Informatique Th\'eorique et Applications}, volume = {25}, year = {1991}, pages = {473-496}, mrnumber = {1144010}, zbl = {0755.68092}, language = {en}, url = {http://dml.mathdoc.fr/item/ITA_1991__25_5_473_0} }
Geffert, Viliam. Normal forms for phrase-structure grammars. RAIRO - Theoretical Informatics and Applications - Informatique Théorique et Applications, Tome 25 (1991) pp. 473-496. http://gdmltest.u-ga.fr/item/ITA_1991__25_5_473_0/
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