Structure of NC(F31)-centers in LiF and its manifestation in optical anisotropy of γ-irradiated crystals Kostyukov, V. M. ; Maksimova, N. T. ; Myreeva, Z. I. ; Zilov, S. A. Abstract Publication: Optics and Spectroscopy Pub Date: October 1995 Bibcode: 1995OptSp..79..574K