TY - CONF T1 - STERNHEIMER FACTORS AND ELECTRIC-FIELD-GRADIENT HYPERPOLARIZABILITIES FOR IONS IN CRYSTALS JO - ZEITSCHRIFT FUR NATURFORSCHUNG SECTION A-A JOURNAL OF PHYSICAL SCIENCES PY - 1994/01/01 AU - FOWLER PW AU - KELLY HM ED - VL - 49 IS - 1-2 SP - 125 EP - 128 Y2 - 2025/05/31 ER -