TY  - JOUR
AU  - O. I. Zavialov
TI  - ``Non-physical'' thresholds in the perturbation theory
JO  - Doklady Akademii Nauk
PY  - 1960
SP  - 64
EP  - 67
VL  - 133
IS  - 1
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/DAN_1960_133_1_a15/
LA  - ru
ID  - DAN_1960_133_1_a15
ER  -