@article{escidoc:0814, title = {{Theory of crystal field states for heavy rare-earth impurities in MgB2}}, author = {Welsch, F. and Kremer, R. and F\"ahnle, M.}, journal = {{Journal of Physics-Condensed Matter}}, volume = {14}, number = {43}, pages = {10273--10279}, year = {2002}, doi = {} }