PT Journal AU Gershenzon, EM Goltsman, GN Multanovskii, VV Ptitsina, NG TI Kinetics of submillimeter impurity and exciton photoconduction in Ge SO Optics and Spectroscopy JI Optics and Spectroscopy PY 1982 BP 454 EP 455 VL 52 IS 4 DE Ge; exciton photoconduction ER