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Sivakumar E., . (2008). Elements of chemical spectroscopy. Chennai: Vijaya Rajeswari Pathippagam.
Sivakumar E.K.T, . 2008. Elements of chemical spectroscopy. Chennai: Vijaya Rajeswari Pathippagam.
Sivakumar E.K.T, . Elements of chemical spectroscopy. Chennai: Vijaya Rajeswari Pathippagam. 2008.