%0 Journal Article %A E. V. Bukhonova %T The Form of Key Function in the Problem of Branching of Periodic Extremals with Resonance~1:1:1 %J Vestnik Ûžno-Uralʹskogo gosudarstvennogo universiteta. Seriâ, Matematičeskoe modelirovanie i programmirovanie %D 2014 %P 23-32 %V 7 %N 3 %I mathdoc %U http://geodesic.mathdoc.fr/item/VYURU_2014_7_3_a1/ %G ru %F VYURU_2014_7_3_a1