1. R. H. Bube: Photoconductivity of Solids (Wiley, New York 1960) Chap. 9
2. P. Bräunlich: “Thermoluminescence and Thermally Stimulated Conductivity”, in Thermoluminescence of Geological Materials, ed. by D. J. McDougall (Academic Press, New York 1968) pp. 61–90
3. A. G. Milnes: Deep Impurities in Semiconductors (Wiley-Interscience, New York 1973) Chap. 9
4. G. F. J. Garlick: Luminescence, in Handbuch der Physik, Vol. 26, ed. by S. Flügge (Springer, Berlin, Göttingen, Heidelberg 1958) pp. 1–128
5. D. Curie: Luminescence in Crystals (Wiley, New York 1963) Chap. 6