1. R. Lemlich, “Adsorptive Bubble Sepr. Tech.”, ed. by R. Lemlich, Academic Press Inc., New York, 1972, pp. 36–38;idem ibid., p. 134.
2. P. Somasundaran, “Sepr. Purific. Method”, Vol. I, ed. by E. S. Perry and C. J. van Oss, Marcel Dekker Inc., New York, 1973, p. 160.
3. See for example, M. Soejima and K. Sugawara, “Seibutsu Kagaku Jikken-Ho” Vol. A–3, ed. by I. Uritaniet al., Tokyo Univ. Press, Tokyo, 1975, p. 89.
4. See for example, B. D. Smith, “Chemical Engineer’s Handbook”, ed. by R. H. Perry and C. H. Chilton, McGraw-Hill Kogakusha, Tokyo, 1973, pp. 13–18.