Yuri\u{\i} Leonidovich Ershov (on the occasion of his fiftieth birthday)
Algebra i logika, Tome 29 (1990) no. 2, pp. 135-138.

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Yuri\u{\i} Leonidovich Ershov (on the occasion of his fiftieth               birthday). Algebra i logika, Tome 29 (1990) no. 2, pp. 135-138. http://geodesic.mathdoc.fr/item/AL_1990_29_2_a0/