TY  - JOUR
AU  - I. A. Lavrov
TI  - Certain properties of retracts of Post numerations
JO  - Algebra i logika
PY  - 1974
SP  - 662
EP  - 675
VL  - 13
IS  - 6
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/AL_1974_13_6_a3/
LA  - ru
ID  - AL_1974_13_6_a3
ER  -