?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.aulast=Ridha&rft.au=Ridha%2C+S.&rft.aufirst=S.&rft.issue=17&rft.atitle=Modified+Johnson+model+for+permeability+estimation+in+oil+well+cement+during+early+hydration&rft.pages=2920-2925&rft.volume=4&rft.title=Research+Journal+of+Applied+Sciences%2C+Engineering+and+Technology&rft.issn=20407459&rft.date=2012&rft.genre=article