%0 Journal Article %A S. Ya. Yakubov %T Multiple completeness for systems of operator bundles and elliptic boundary value problem %J Sbornik. Mathematics %D 1991 %P 99-119 %V 69 %N 1 %U http://geodesic.mathdoc.fr/item/SM_1991_69_1_a6/ %G en %F SM_1991_69_1_a6