@article{ITA_1990__24_5_459_0, author = {Neraud, Jean}, title = {Elementariness of a finite set of words is co-NP-complete}, journal = {RAIRO - Theoretical Informatics and Applications - Informatique Th\'eorique et Applications}, volume = {24}, year = {1990}, pages = {459-470}, mrnumber = {1080501}, zbl = {0704.68065}, language = {en}, url = {http://dml.mathdoc.fr/item/ITA_1990__24_5_459_0} }
Neraud, Jean. Elementariness of a finite set of words is co-NP-complete. RAIRO - Theoretical Informatics and Applications - Informatique Théorique et Applications, Tome 24 (1990) pp. 459-470. http://gdmltest.u-ga.fr/item/ITA_1990__24_5_459_0/
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