%0 Journal Article %A M. D. Bronshtein %T Functionals containing idempotent integration and their applications to the estimation of the minimal eigenvalue of differential operators %J Doklady Akademii Nauk %D 1991 %P 265-268 %V 320 %N 2 %I mathdoc %U http://geodesic.mathdoc.fr/item/DAN_1991_320_2_a0/ %G ru %F DAN_1991_320_2_a0