Temperature shift and broadening of luminescence and absorption lines of Nd3 + ion in fluoroapatite crystals Minkov, B. I. ; Ostrovskaya, E. M. ; Sazonova, S. A. ; Skorobogatov, B. S. Abstract Publication: Optics and Spectroscopy Pub Date: April 1976 Bibcode: 1976OptSp..40..407M