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2. L. Bellamy, Advances in Infrared Group Frequencies, Methuen and Co., London (1968).
3. The Infrared Spectra of Complex Molecules, John Wiley & Sons, New York (1958).
4. Chemical Applications of Spectroscopy, Vol. 9 of Techniques of Organic Chemistry, Inter Science, New York (1958).
5. A. D. Cross, Introduction to Practical Infrared Spectroscopy, Butterworths, London (1961).