%0 Journal Article
%A Yu. G. Rudoi
%T Bogolyubov's statistical variational principle and the Green's function method applied to the Heisenberg--Ising model
%J Teoretičeskaâ i matematičeskaâ fizika
%D 1970
%P 129-148
%V 2
%N 1
%I mathdoc
%U http://geodesic.mathdoc.fr/item/TMF_1970_2_1_a10/
%G ru
%F TMF_1970_2_1_a10