%0 Journal Article
%A P. G. Grinevich
%A S. P. Novikov
%T Real finite-zone solutions of the sine-Gordon equation: a~formula for the topological charge
%J Trudy Matematicheskogo Instituta imeni V.A. Steklova
%D 2001
%P 980-981
%V 56
%N 5
%I mathdoc
%U http://geodesic.mathdoc.fr/item/RM_2001_56_5_a5/
%G en
%F RM_2001_56_5_a5