?url_ver=Z39.88-2004&rft_id=10.4028%2Fwww.scientific.net%2FKEM.744.131&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.au=Zahid%2C+M.&rft.aulast=Zahid&rft.aufirst=M.&rft.isbn=9783035711165&rft.volume=744+74&rft.issn=10139826&rft.pages=131-135&rft.atitle=Effect+of+partial+replacement+of+fly+ash+by+metakaolin+on+strength+development+of+fly+ash+based+geopolymer+mortar&rft.title=Key+Engineering+Materials&rft.date=2017&rft.genre=article