TY  - JOUR
AU  - R. Sh. Omanadze
TI  - On the upper semilattice of recursively enumerable ${\rm
JO  - Algebra i logika
PY  - 1991
SP  - 405
EP  - 413
VL  - 30
IS  - 4
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/AL_1991_30_4_a1/
LA  - ru
ID  - AL_1991_30_4_a1
ER  -