%0 Journal Article
%A K. I. Babenko
%T On the theory of the second variation of functionals on the class $S$ of univalent functions
%J Doklady Akademii Nauk
%D 1970
%P 970-973
%V 193
%N 5
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DAN_1970_193_5_a1/
%G ru
%F DAN_1970_193_5_a1