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- M. Fadel, S. S. Fouad, E. G. El-Metwally "Theoretical observation on the experimental data of Ge-Se-Tl system"....................p. 79-86 (pdf file).
- I. Banik "Electron processes connected with low energy optical absorption and with photoluminescence in non-crystalline semiconductors from point of view of barrier cluster model"......................p. 87-93 (pdf file).