A programme for electron-impact broadening parameter calculations of   ionized rare-earth element lines
  In order to provide atomic data needed for astrophysical investigations, a set of electron-impact broadening parameters for ionized rare-earth element lines should be calculated. We are going to calculate the electron-impact broadening parameters for more than 50 transitions of ionized rare-earth elements. Taking into account that the spectra of these elements are very complex, for calculation we can use the modified semiempirical approach - MSE or simplified MSE. Also, we can estimate these parameters on the basis of regularities and systematic trends. 
L.C. Popovic, M.S. Dimitrijevic (Astr. Obs. Belgrade, Serbia)