%0 Journal Article %A A. V. Strauss %T On the extensions and the characteristic function of a~symmetric operator %J Izvestiya. Mathematics %D 1968 %P 181-203 %V 2 %N 1 %I mathdoc %U http://geodesic.mathdoc.fr/item/IM2_1968_2_1_a7/ %G en %F IM2_1968_2_1_a7