1. J. Tauc (Ed.): Amorphous and Liquid Semiconductors (Plenum, London 1974)
2. R.A. Zingaro, W.C. Cooper: Selenium (Van Nostrand Reinhold, New York 1974)
3. E. Gerlach, P. Grosse (Eds.): The Physics of Selenium and Tellurium (Springer, Berlin 1979)
4. N.F. Mott, E.A. Davis: Electronic Processes in Non-Crystalline Materials, 2nd edn. (Clarendon, Oxford 1979)
5. M.A. Popescu: Non-Crystalline Chalcogenides (Kluwer Academic, Dordrecht 2001)