TY  - JOUR
AU  - N. A. Serdyukova
TI  - On generalizations of purity
JO  - Algebra i logika
PY  - 1991
SP  - 432
EP  - 456
VL  - 30
IS  - 4
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/AL_1991_30_4_a3/
LA  - ru
ID  - AL_1991_30_4_a3
ER  -