TY  - JOUR
AU  - V. B. Kudryavtsev
TI  - On the functional system $\mathscr{P}_\Sigma$
JO  - Doklady Akademii Nauk
PY  - 1973
SP  - 521
EP  - 522
VL  - 210
IS  - 3
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/DAN_1973_210_3_a2/
LA  - ru
ID  - DAN_1973_210_3_a2
ER  -