1. H. Ohya, V. V. Kudryavtsev, and S. I. Semenova Eds., Polyimide Membranes: Applications, Fabrications, and Properties (Gordon and Breach, Tokyo, Amsterdam, Kodansha, 1996).
2. M. K. Ghosh and K. L. Mittal Eds., Polyimides: Fundamentals and Applications (Marcel Dekker, New York, 1996).
3. K. Tanaka and K.-I. Okamoto, in Materials Science of Membranes for Gas and Vapor Separation, Ed. by Y. Yampolskii, I. Pinnau, and B. Freeman (John Wiley & Sons, Ltd., Chichester, UK, 2006).
4. Ube Industries. www.ube.com/contents/en/chemical/ separation/index.html.
5. Evonik. www.membrane-separation.com/en.