On the Determination of the Energy Spectrum of an Impurity Ion with an Unfilled d Shell in a Crystal Men, A. N. ; Sokolov, A. V. ; Zvezdina, N. A. ; Kurushin, Yu. N. ; Nekoshnov, B. M. ; Chudakov, V. S. Abstract Publication: Optics and Spectroscopy Pub Date: October 1965 Bibcode: 1965OptSp..19..325M