1. Sebba, F. 1960 Nature,188,736–737.
2. Padday, J. F. 1957 In Proc. 2nd Int. Cong. Surface Activity , vol. 1,pp.1–6.Butterworths.
3. Davies, J. T. & Vose, R. W. 1965 Proc. Roy. Soc A286,218–234.
4. Lemlich, R. 1972 Adsorptive Bubble Separation Techniques ,pp.1–5,133–143.Academic.
5. Gleim, V. G. , Shelomov, I. K. & Shidlovskii, B. R. 1959 J. Appl. Chem. U.S.S.R. 32,1069–1072.