@article{escidoc:0649, title = {{Crystal field parameters at the (0001) surface of rare-earth metals: an ab initio study}}, author = {Welsch, F. and F\"ahnle, M. and Jensen, P. J.}, journal = {{Journal of Physics: Condensed Matter}}, volume = {17}, pages = {2061--2072}, year = {2005}, doi = {} }