Geodesic
Algorithmic problems and hierarchies of first-order languages
Algebra i logika, Tome 26 (1987) no. 4, pp. 419-434.

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     author = {Yu. M. Vazhenin},
     title = {Algorithmic problems and hierarchies of first-order languages},
     journal = {Algebra i logika},
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     volume = {26},
     number = {4},
     year = {1987},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/AL_1987_26_4_a1/}
}
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Yu. M. Vazhenin. Algorithmic problems and hierarchies of first-order languages. Algebra i logika, Tome 26 (1987) no. 4, pp. 419-434. http://geodesic.mathdoc.fr/item/AL_1987_26_4_a1/