1. B. Gross:Charge Storage in Solid Dielectrics (Amsterdam).
2. J. Van Turnhout:Thermally stimulated discharge of polymer electrets, TNO-Comun. 471-Delft.
3. C. Bucci, R. Fieschi andG. Guidi:Phys. Rev.,148, 816 (1966).
4. M. Siu-Li, M. F. de Souza andF. Lüty:Off center Cu+ ions in potassium halides studied with thermocurrents, to be published inPhys. Rev.
5. B. Gross:Journ. Electrochem. Soc.,115, 376 (1968);119, 855 (1972).