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3. Ašperger, S., and Ingold, C. K., J. Chem. Soc., 2862 (1956).
4. Mathieu, J.-P., Bull. Soc. Chim., France, V, 3, 2121 (1936).
5. Mathieu, J.-P., Bull. Soc. Chim., France, V, 3, 2152 (1936).