?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.au=Coppens%2C+M&rft.aufirst=M&rft.aulast=Coppens&rft.volume=87&rft.issue=12&rft.atitle=Effects+of+surface+roughness+on+self-+and+transport+diffusion+in+porous+media+in+the+Knudsen+regime&rft.title=Physical+Review+Letters&rft.date=September+2001&rft.genre=article