%0 Journal Article %A K. S. Matviichuk %T Mathematical description of the states of bose and fermi systems by the method of partial density matrices of the canonical ensemble %J Teoretičeskaâ i matematičeskaâ fizika %D 1979 %P 346-367 %V 41 %N 3 %I mathdoc %U http://geodesic.mathdoc.fr/item/TMF_1979_41_3_a5/ %G ru %F TMF_1979_41_3_a5