E. Krasovskii

Green’s function theory of magnetism in Bi <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"> <mml:msub> <mml:mi/> <mml:mn>2</mml:mn> </mml:msub>

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 a collinear spin-half antiferromagnet and applied to magnetic excitations in Bi$_2$CuO$_4$. The spin Hamiltonian includes both the out-of-pl...