?url_ver=Z39.88-2004&rft_id=10.1680%2Fstco.2006.7.4.159&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.aufirst=N.&rft.au=Shafiq%2C+N.&rft.aulast=Shafiq&rft.volume=7&rft.issn=14644177&rft.issue=4&rft.atitle=Calculation+of+the+coefficients+of+oxygen+permeability+of+mortar+samples+using+PORECOR+analysis&rft.pages=159-164&rft.title=Structural+Concrete&rft.date=2006&rft.genre=article