1. W. S.Struve , Fundamentals of Molecular Spectroscopy , John Wiley & Sons , New York , 1989
2. J. M.Hollas , Modern Spectroscopy , John Wiley & Sons , 2004
3. V. P.Gupta , Interaction of Radiation and Matter and Electronic Spectra , Principles and Applications of Quantum Chemistry , Academic Press , 2016
4. Bestimmung der Absorption des rothen Lichts in farbigen Flüssigkeiten
5. MOLECULAR ELECTRONIC SPECTRAL BROADENING IN LIQUIDS AND GLASSES