Geodesic
The upper semilattice of numerations of a finite set
Algebra i logika, Tome 14 (1975) no. 3, pp. 258-284.

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     author = {Yu. L. Ershov},
     title = {The upper semilattice of numerations of a finite set},
     journal = {Algebra i logika},
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     volume = {14},
     number = {3},
     year = {1975},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/AL_1975_14_3_a1/}
}
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Yu. L. Ershov. The upper semilattice of numerations of a finite set. Algebra i logika, Tome 14 (1975) no. 3, pp. 258-284. http://geodesic.mathdoc.fr/item/AL_1975_14_3_a1/