%0 Journal Article
%A É. A. Arinstein
%T Perturbation Theory for Density Matrices and the Thermodynamic Potential of a~Quantum System
%J Teoretičeskaâ i matematičeskaâ fizika
%D 2002
%P 54-63
%V 130
%N 1
%I mathdoc
%U http://geodesic.mathdoc.fr/item/TMF_2002_130_1_a3/
%G ru
%F TMF_2002_130_1_a3