Geodesic
Depth of formulas in some classes of $k$-valued logic
Vestnik Moskovskogo universiteta. Matematika, mehanika, no. 4 (1991), pp. 44-47 
A. B. Ugol'nikov. Depth of formulas in some classes of $k$-valued logic. Vestnik Moskovskogo universiteta. Matematika, mehanika, no. 4 (1991), pp. 44-47. http://geodesic.mathdoc.fr/item/VMUMM_1991_4_a10/
@article{VMUMM_1991_4_a10,
     author = {A. B. Ugol'nikov},
     title = {Depth of formulas in some classes of $k$-valued logic},
     journal = {Vestnik Moskovskogo universiteta. Matematika, mehanika},
     pages = {44--47},
     year = {1991},
     number = {4},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/VMUMM_1991_4_a10/}
}
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