%0 Journal Article %A A. S. Bratus' %T Multiple eigenvalues in problems of optimization of spectral properties of systems with a finite number of degrees of freedom %J Žurnal vyčislitelʹnoj matematiki i matematičeskoj fiziki %D 1986 %P 645-654 %V 26 %N 5 %I mathdoc %U http://geodesic.mathdoc.fr/item/ZVMMF_1986_26_5_a1/ %G ru %F ZVMMF_1986_26_5_a1