?url_ver=Z39.88-2004&rft_id=10.3923%2Fjas.2011.1612.1617&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.aufirst=A.D.&rft.au=Woldeyohannes%2C+A.D.&rft.aulast=Woldeyohannes&rft.date=2011&rft.title=Journal+of+Applied+Sciences&rft.atitle=Effect+of+age+of+pipes+on+performance+of+natural+gas+transmission+pipeline+network+system&rft.pages=1612-1617&rft.issue=9&rft.volume=11&rft.issn=18125654&rft.genre=article