%0 Journal Article
%A L. M. Berkovich
%A V. I. Kval'vasser
%T Operator identities and certain ordinary linear differential equations of higher orders which are integrable in closed form
%J Izvestiâ vysših učebnyh zavedenij. Matematika
%D 1968
%P 3-16
%N 5
%I mathdoc
%U http://geodesic.mathdoc.fr/item/IVM_1968_5_a0/
%G ru
%F IVM_1968_5_a0