1. L. Bellamy, Infrared Spectra of Complex Molecules, second ed., Methuen, London/Wiley, New York (1958).
2. R. Ryhage, S. Stallberg-Stenhagen, and E. Stenhagen, Arkiv. Kemi,14, 259 (1959).
3. H. Budzikiewicz, C. Djerassi, and D. Williams, Interpretation of Mass Spectra of Organic Compounds, Holden-Day, San Francisco (1964).
4. J. Slomp and F. Mackellar, J. Am. Chem. Soc.,82, 999 (1960).