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2. E. N. Karaulova, in: Science Reviews. Chemistry of Petroleum and Gas [in Russian], Vol. 2, Izd. AN SSSR (1958), p. 130.
3. N. K. Kharasch, Organic Sulfur Compounds, Vol. 1, London (1961).
4. K. Weiland-Hilgetag, Experimental Procedures in Organic Chemistry [Russian translation], Khimiya (1968), p. 611.
5. D. Swern, Chem. Rev.,45, 1 (1949).