TY  - JOUR
AU  - P. L. Ul'yanov
TI  - On equivalent conditions for the convergence of series and
JO  - Doklady Akademii Nauk
PY  - 1995
SP  - 458
EP  - 462
VL  - 343
IS  - 4
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/DAN_1995_343_4_a6/
LA  - ru
ID  - DAN_1995_343_4_a6
ER  -