TY - BOOK AU - Townsend,P.D.(Peter David) AU - Kelly,J.C.(John Clive) TI - Colour centres and imperfections in insulators and semiconductors SN - 0856210226 PY - 1973/// CY - London PB - Chatto & Windus KW - Color centers KW - Electric insulators and insulation KW - Defects KW - Semiconductors ER -