?url_ver=Z39.88-2004&rft_id=10.1016%2Fj.seppur.2012.02.031&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.aufirst=S.&rft.aulast=Rafiq&rft.au=Rafiq%2C+S.&rft.title=Separation+and+Purification+Technology&rft.issn=13835866&rft.atitle=Separation+of+CO+2+from+CH+4+using+polysulfone%2F+polyimide+silica+nanocomposite+membranes&rft.volume=90&rft.date=2012&rft.pages=162-172&rft.genre=article