%0 Journal Article
%A M. A. Akivis
%T On an invariant differential-geometric characteristic of the Dupin cyclide
%J Trudy Matematicheskogo Instituta imeni V.A. Steklova
%D 1965
%V 20
%N 1
%I mathdoc
%U http://geodesic.mathdoc.fr/item/RM_1965_20_1_a7/
%G ru
%F RM_1965_20_1_a7