no. 2
Trace languages defined by regular string languages
RAIRO - Theoretical Informatics and Applications - Informatique Théorique et Applications, Tome 20 (1986) no. 2, pp. 103-119. 
@article{ITA_1986__20_2_103_0,
     author = {Aalbersberg, Ijsbrand Jan and Welzl, Emo},
     title = {Trace languages defined by regular string languages},
     journal = {RAIRO - Theoretical Informatics and Applications - Informatique Th\'eorique et Applications},
     pages = {103--119},
     publisher = {AFCET - Gauthier-Villars},
     address = {Paris},
     volume = {20},
     number = {2},
     year = {1986},
     mrnumber = {860763},
     zbl = {0612.68071},
     language = {en},
     url = {http://www.numdam.org/item/ITA_1986__20_2_103_0/}
}
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Aalbersberg, Ijsbrand Jan; Welzl, Emo. Trace languages defined by regular string languages. RAIRO - Theoretical Informatics and Applications - Informatique Théorique et Applications, Tome 20 (1986) no. 2, pp. 103-119. http://www.numdam.org/item/ITA_1986__20_2_103_0/

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