%0 Journal Article
%A F. Z. Ziatdinov
%T The spectrum of a linear second-order differential operator in a Hilbert space of vector-functions with values in an abstract Hilbert space.~I
%J Izvestiâ vysših učebnyh zavedenij. Matematika
%D 1964
%P 46-58
%N 6
%I mathdoc
%U http://geodesic.mathdoc.fr/item/IVM_1964_6_a6/
%G ru
%F IVM_1964_6_a6