no. 3
On existentially first-order definable languages and their relation to NP
RAIRO - Theoretical Informatics and Applications - Informatique Théorique et Applications, Tome 33 (1999) no. 3, pp. 259-269. 
@article{ITA_1999__33_3_259_0,
     author = {Borchert, Bernd and Kuske, Dietrich and Stephan, Frank},
     title = {On existentially first-order definable languages and their relation to {NP}},
     journal = {RAIRO - Theoretical Informatics and Applications - Informatique Th\'eorique et Applications},
     pages = {259--269},
     publisher = {EDP-Sciences},
     volume = {33},
     number = {3},
     year = {1999},
     mrnumber = {1728426},
     zbl = {0949.03035},
     language = {en},
     url = {http://www.numdam.org/item/ITA_1999__33_3_259_0/}
}
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JO  - RAIRO - Theoretical Informatics and Applications - Informatique Théorique et Applications
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Borchert, Bernd; Kuske, Dietrich; Stephan, Frank. On existentially first-order definable languages and their relation to NP. RAIRO - Theoretical Informatics and Applications - Informatique Théorique et Applications, Tome 33 (1999) no. 3, pp. 259-269. http://www.numdam.org/item/ITA_1999__33_3_259_0/

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