@article{escidoc:0511, title = {{Ab initio calculations of adiabatic magnon spectra using the atomic-sphere aproximation for the spin direction}}, author = {Singer, R. and Dietermann, F. and Steiauf, D. and F\"ahnle, M.}, journal = {{Physical Review B}}, volume = {76}, year = {2007}, doi = {10.1103/PhysRevB.76.052403} }