%0 Journal Article %A V. P. Shestopalov %T On nonlinear processes in the diffraction radiation generators -- free electron lasers %J Doklady Akademii Nauk %D 1981 %P 1116-1118 %V 261 %N 5 %I mathdoc %U http://geodesic.mathdoc.fr/item/DAN_1981_261_5_a22/ %G ru %F DAN_1981_261_5_a22