Green's function theory of magnetism in Bi${}_2$CuO${}_4$: anisotropic Heisenberg XYZ model

R. O. Kuzian, E. E. Krasovskii

The Green's function theory of Lymar' and Rudoi [Theor. Math. Phys. vol. 21, 990 (1974)] is generalized to the case of multiple intra- and inter-sublattice magnetic interactions in…