%0 Journal Article
%A M. A. Krasnosel'skii
%A V. V. Strygin
%T Calculation of the rotation of completely continuous vector fields associated with the problem of periodic 

%J Doklady Akademii Nauk
%D 1963
%P 540-543
%V 152
%N 3
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DAN_1963_152_3_a8/
%G ru
%F DAN_1963_152_3_a8