1. Efros, L.S. and Kvitko, I.Ya., Khimiya i tekhnologiya aromaticheskikh soedinenii v zadachakh i uprazhneniyakh (Chemistry and Technology of Aromatic Compounds in Tasks and Exercises), Moscow: Khimiya, 1971, p. 81.
2. Spryskov, A.A. and Kozlov, I.A., Izv. Vyssh. Uchebn. Zaved.,Khim. Khim. Tekhnol., 1968, vol. 11, no. 7, p. 785.
3. Spryskov, A.A. and Kachurin, O.I., Izv. Vyssh. Uchebn. Zaved., Khim. Khim. Tekhnol., 1958, no. 1, p. 97.
4. Parsons, J.S., J. Gas Shromatogr., 1967, vol. 5, no. 5, p. 254.
5. Himes, J.B. and Dowbak, I.J., J. Gas Shromatogr., 1965, vol. 3, no. 6, p. 194.