Geodesic
On a conjecture of V. A. Uspenskiĭ
Algebra i logika, Tome 1 (1962) no. 4, pp. 45-48 
Yu. L. Ershov. On a conjecture of V. A. Uspenskiĭ. Algebra i logika, Tome 1 (1962) no. 4, pp. 45-48. http://geodesic.mathdoc.fr/item/AL_1962_1_4_a2/
@article{AL_1962_1_4_a2,
     author = {Yu. L. Ershov},
     title = {On a conjecture of {V.} {A.} {Uspenski\u{i}}},
     journal = {Algebra i logika},
     pages = {45--48},
     year = {1962},
     volume = {1},
     number = {4},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/AL_1962_1_4_a2/}
}
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