no. 3
Lower space bounds for accepting shuffle languages
RAIRO - Theoretical Informatics and Applications - Informatique Théorique et Applications, Tome 33 (1999) no. 3, pp. 303-307. 
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     author = {Szepietowski, Andrzej},
     title = {Lower space bounds for accepting shuffle languages},
     journal = {RAIRO - Theoretical Informatics and Applications - Informatique Th\'eorique et Applications},
     pages = {303--307},
     publisher = {EDP-Sciences},
     volume = {33},
     number = {3},
     year = {1999},
     mrnumber = {1728429},
     zbl = {0951.68067},
     language = {en},
     url = {http://www.numdam.org/item/ITA_1999__33_3_303_0/}
}
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Szepietowski, Andrzej. Lower space bounds for accepting shuffle languages. RAIRO - Theoretical Informatics and Applications - Informatique Théorique et Applications, Tome 33 (1999) no. 3, pp. 303-307. http://www.numdam.org/item/ITA_1999__33_3_303_0/

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