Sleeckx, E., Tichý, L., Nagels, P., Callaerts, R. Thermally and photo-induced irreversible changes in the optical properties of amorphous GexSe100-x films. Journal of Non-Crystalline Solids. 1996, 198-200(-), 723-727. ISSN 0022-3093. E-ISSN 1873-4812.