no. 3
On ambiguity in DOS systems
RAIRO. Informatique théorique, Tome 18 (1984) no. 3, pp. 279-295. 
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     author = {Ehrenfeucht, Andrzej and Haussler, David and Rozenberg, Grzegorz},
     title = {On ambiguity in {DOS} systems},
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     pages = {279--295},
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     volume = {18},
     number = {3},
     year = {1984},
     mrnumber = {763671},
     zbl = {0565.68068},
     language = {en},
     url = {http://www.numdam.org/item/ITA_1984__18_3_279_0/}
}
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Ehrenfeucht, Andrzej; Haussler, David; Rozenberg, Grzegorz. On ambiguity in DOS systems. RAIRO. Informatique théorique, Tome 18 (1984) no. 3, pp. 279-295. http://www.numdam.org/item/ITA_1984__18_3_279_0/

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