Geodesic
Fine hierarchy of formulas
Algebra i logika, Tome 30 (1991) no. 5, pp. 568-582.

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     author = {V. L. Selivanov},
     title = {Fine hierarchy of formulas},
     journal = {Algebra i logika},
     pages = {568--582},
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     volume = {30},
     number = {5},
     year = {1991},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/AL_1991_30_5_a4/}
}
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V. L. Selivanov. Fine hierarchy of formulas. Algebra i logika, Tome 30 (1991) no. 5, pp. 568-582. http://geodesic.mathdoc.fr/item/AL_1991_30_5_a4/