TY  - JOUR
AU  - Yu. L. Ershov
TI  - Relative regular closure and $\pi$-normalizations
JO  - Algebra i logika
PY  - 1992
SP  - 592
EP  - 623
VL  - 31
IS  - 6
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/AL_1992_31_6_a1/
LA  - ru
ID  - AL_1992_31_6_a1
ER  -