TY - JOUR T1 - CALCULATION OF LOCAL AND GAP MODE FREQUENCIES FROM IMPURITIES IN ALKALI-HALIDE CRYSTALS JO - J PHYS C SOLID STATE PY - 1986/11/10 AU - SANGSTER MJL AU - HARDING JH ED - VL - 19 IS - 31 SP - 6153 EP - 6167 Y2 - 2024/12/22 ER -