1. E. W. Dewing and N. W. F. Phillips: French Patent 1,501,177, 10 Nov. 1967.
2. T. Østvold:Acta Chem. Scand., 1966, vol. 20, pp. 2187–91.
3. NAF Thermochemical Tables, 2nd ed., U.S. National Standard Reference Data System, NRDS-NBS 37, Washington, D.C., 1971.
4. J. T. Viola, A. A. Fannin, Jr., L. A. King, and D. W. Seegmiller:J. Chem. Eng. Data, 1978, vol. 23, pp. 118–22.
5. G. N. Lewis, M. Randall, K. S. Pitzer, and L. Brewer:Thermodynamics, 2nd ed., p. 187, McGraw-Hill Book Co., New York, 1961.