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1. Characterization of PPO membranes by oxygen plasma etching, gas separation and atomic force microscopy / K. C. Khulbe and T. Matsuura // Journal of Membrane Science. Volume 171, Issue 2, 30 June 2000, Pages 273-284
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http://dx.doi.org/10.1016/S0376-7388(00)00311-2Preparation and characterization of gas separation hollow fiber membranes based on polyethersulfone-polyimide miscible blends / G. C. Kapantaidakis, G. H. Koops and M. Wessling // Desalination. Volume 145, Issues 1-3, 10 September 2002, Pages 353-357
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http://dx.doi.org/10.1016/S0011-9164(02)00435-6