1. 1) Reynolds, W. W., Physical Chemistry of Petroleum Solvents, Reinhold Publ. Corp., New York, 1963, p.154.
2. 2) Blom, A. V., Farben Ztg., 36,873 (1931)
3. 3) Stewart, J. K. and Bewick, H. L., Ind. Eng. Chem., 28,940 (1936)
4. 4) Bogin, C. and Wampner, H. L., ibid., 29, 1012 (1937)
5. 5) Wright, P. D., J. Oil and Colour Chem. Assoc., 39,129 (1956)