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3. R.L. Riley, R.L. Grabowsky, Preparation of gas separation membranes, AP 4243701, 1981
4. T. Yamada, S. Kurisu, S. Azuma, K. Sugie, T. Yamaji, AP 4406673, 1983
5. I. Cabasso, K.A. Lundy, Method of making membranes for gas separation and the composite membranes, AP 4602922, 1986