1. J. D. Carruthers, P. A. Cutting, R. E. Day, M. R. Harris, S. A. Mitchell, and K. S. W. Sing, Chem. & Ind., 1968, 1772.
2. M. R. Harris and K. S. W. Sing, The surface properties of precipitate alumina, J. Appl. Chem., 5, 223 (1955).
3. B. C. Lippens, B. G. Linsen, and J. H. DeBoer, Studies on pore systems in catalysts, 1, J. Catalysis, 3, 32 (1964).
4. Handbook of Chemistry and Physics, 44th Edition (C. D. Hodgman, ed.), The Chemical Rubber Publishing Co., Cleveland, Ohio, U. S. A. (1962), p. 2702.
5. Ibid., p. 2439