%0 Journal Article %A A. A. Kazakov %T Perturbation theory for the Green's functions of the Heisenberg model with single-ion anisotropy %J Teoretičeskaâ i matematičeskaâ fizika %D 1975 %P 281-288 %V 23 %N 2 %I mathdoc %U http://geodesic.mathdoc.fr/item/TMF_1975_23_2_a12/ %G ru %F TMF_1975_23_2_a12