PT Unknown AU Gershenzon, E Goltsman, G Elantev, A Kagane, M TI Energy-spectrum of small donors and acceptors in germanium and effect of magnetic-field on it SE Izv. Akad. Nauk SSSR, Seriya Fizicheskaya PY 1978 BP 1142 EP 1148 VL 42 IS 6 DE energy spectrum; Ge; magnetic field ER