1. R. J. R. Uhlhorn, K. Keizer and A. J. Burggraaf, J. Mater. Sci. 26 (1991) in press.
2. Idem, in ?Advances in reverse osmosis and ultrafiltration?, edited by T. Matsuura (ACS, Washington, 1989) p. 235.
3. Idem, Dutch Patent 8 901 080, (1989).
4. Idem, J. Membr. Sci. to be published.
5. Idem, ibid., to be published.