TY  - JOUR
AU  - P. E. Alaev
TI  - Ash’s theorem on $\Delta^0_\alpha$-categorical structures and a~condition for infinite $\Delta^0_\alpha$-dimension
JO  - Algebra i logika
PY  - 2015
SP  - 551
EP  - 574
VL  - 54
IS  - 5
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/AL_2015_54_5_a0/
LA  - ru
ID  - AL_2015_54_5_a0
ER  -