TY  - JOUR
AU  - V. P. Elizarov
TI  - Equivalent definitions of a perfect system and some of its properties
JO  - Matematičeskie zametki
PY  - 1981
SP  - 335
EP  - 350
VL  - 29
IS  - 3
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/MZM_1981_29_3_a1/
LA  - ru
ID  - MZM_1981_29_3_a1
ER  -