Gupta, S.L.. Elements of Spectroscopy / Textual Documents S.L.Gupta, V.Kumar & R.C.Sharma. - 20th / - Agra : Pragati Prakasan , 2007. - 597 : ill ; 22cm . Index ISBN: 81-8398-`176-3 Subjects--Index Terms: Spectroscopy Molecular Spectra G-Physics Dewey Class. No.: 535.84 / G 959 El