TY  - JOUR
AU  - A. N. Degtev
TI  - Several remarks on retraceable, regressive and pointwise
JO  - Algebra i logika
PY  - 1970
SP  - 651
EP  - 660
VL  - 9
IS  - 6
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/AL_1970_9_6_a3/
LA  - ru
ID  - AL_1970_9_6_a3
ER  -