TY  - JOUR
AU  - V. G. Durnev
TI  - Undecidability of a~simple fragment of a~positive theory with a~single constant for a~free semigroup of rank two
JO  - Matematičeskie zametki
PY  - 2000
SP  - 191
EP  - 200
VL  - 67
IS  - 2
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/MZM_2000_67_2_a2/
LA  - ru
ID  - MZM_2000_67_2_a2
ER  -