Geodesic
Depth and polynomial equivalence of formulas for closed classes of two-valued logic
Matematičeskie zametki, Tome 42 (1987) no. 4, pp. 603-612.

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     author = {A. B. Ugol'nikov},
     title = {Depth and polynomial equivalence of formulas for closed classes of two-valued logic},
     journal = {Matemati\v{c}eskie zametki},
     pages = {603--612},
     publisher = {mathdoc},
     volume = {42},
     number = {4},
     year = {1987},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1987_42_4_a12/}
}
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A. B. Ugol'nikov. Depth and polynomial equivalence of formulas for closed classes of two-valued logic. Matematičeskie zametki, Tome 42 (1987) no. 4, pp. 603-612. http://geodesic.mathdoc.fr/item/MZM_1987_42_4_a12/