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3. P.W. Atkins, R.S. Friedman: Molecular Quantum Mechanics, 3rd edn. (Oxford Univ. Press, New York 1997)
4. B. Henderson, G.F. Imbusch: Optical Spectroscopy of Inorganic Solids (Oxford Univ. Press, Oxford 1985)
5. W. Demtröder: Laser Spectroscopy: Basic Concepts and Instrumentation, 3rd edn. (Springer, Berlin 2003)