%0 Journal Article %A M. M. Khapaev %T Non linear theory of the motion of fast charged particles in helical toroidal magnetic fields %J Doklady Akademii Nauk %D 1965 %P 343-346 %V 163 %N 2 %I mathdoc %U http://geodesic.mathdoc.fr/item/DAN_1965_163_2_a21/ %G ru %F DAN_1965_163_2_a21