@article{escidoc:0566, title = {{Heisenberg Hamiltonian description of multiple-sublattice itinerant-electron systems: general considerations and applications to NiMnSb and MnAs}}, author = {Sandratskii, L. M. and Singer, R. and \c{S}a\c{s}io\u{g}lu, E.}, journal = {{Physical Review B}}, volume = {76}, year = {2007}, doi = {10.1103/PhysRevB.76.184406} }