%0 Journal Article %T Application of Cardo-type polyimide (PI) and polyphenylene oxide (PPO) hollow fiber membranes in two-stage membrane systems for CO2/CH4 separation %A Pourafshari Chenar, Mahdi %A M. Soltanieh %A T. Matsuura %A A. Tabe-Mohammadi %A M. Sadeghi %J Journal of Membrane Science %@ 0376-7388 %D 2008