TY  - JOUR
AU  - V. G. Durnev
AU  - O. V. Zetkina
AU  - A. I. Zetkina
TI  - On ``simple'' algorithmically undecidable fragments of elementary theory of an infinitely generated free semigroup
JO  - Čebyševskij sbornik
PY  - 2020
SP  - 56
EP  - 71
VL  - 21
IS  - 4
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/CHEB_2020_21_4_a6/
LA  - ru
ID  - CHEB_2020_21_4_a6
ER  -