TY  - JOUR
AU  - Ya. N. Fel'd
TI  - On the quadratic lemma in electrodynamics
JO  - Doklady Akademii Nauk
PY  - 1992
SP  - 321
EP  - 324
VL  - 324
IS  - 2
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/DAN_1992_324_2_a16/
LA  - ru
ID  - DAN_1992_324_2_a16
ER  -