%0 Journal Article %A V. A. Shcherbina %T Causality condition and nonlocality of the Lagrangian in quantum electrodynamics %J Doklady Akademii Nauk %D 1961 %P 93-95 %V 138 %N 1 %I mathdoc %U http://geodesic.mathdoc.fr/item/DAN_1961_138_1_a25/ %G ru %F DAN_1961_138_1_a25