Gupta, S.L.. Elements of Spectroscopy / Textual Documents S.L.Gupta, V.Kumar & R.C.Sharma. - 2nd ed. / - Agra : Pragati Prakasan , 1977. - 335p. : ill ; 22cm . Subjects--Index Terms: Spectroscopy G-Physics T/G-Physics T/G-Physics Dewey Class. No.: 535.5 / G 959 El