TY  - JOUR
AU  - Yu. L. Ershov
TI  - The $d$-rank of an $\alpha$-space does not exceed~$1$
JO  - Algebra i logika
PY  - 2019
SP  - 706
EP  - 713
VL  - 58
IS  - 6
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/AL_2019_58_6_a1/
LA  - ru
ID  - AL_2019_58_6_a1
ER  -