no. 3
Pm numbers, ambiguity, and regularity
RAIRO. Informatique théorique et applications, Tome 27 (1993) no. 3, pp. 261-275 
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     pages = {261--275},
     year = {1993},
     publisher = {EDP-Sciences},
     volume = {27},
     number = {3},
     mrnumber = {1227945},
     zbl = {0806.11007},
     language = {en},
     url = {https://www.numdam.org/item/ITA_1993__27_3_261_0/}
}
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Cameron, H. A.; Wood, D. Pm numbers, ambiguity, and regularity. RAIRO. Informatique théorique et applications, Tome 27 (1993) no. 3, pp. 261-275. https://www.numdam.org/item/ITA_1993__27_3_261_0/

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