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2. K. Siegbahn, C. Nordling, A. Fahlman, et al., ESCA Applied to Free Molecules [Russian translation], Mir, Moscow (1971).
3. An Introduction to UPS;J. H. D. Eland,1974
4. T. A. Carlson, Photoelectron and Auger Spectroscopy, Tennessee (1975).
5. A. D. Baker and D. Betteridge, Photoelectron Spectroscopy, Pergamon Press (1972).