?url_ver=Z39.88-2004&rft_id=10.4028%2Fwww.scientific.net%2FKEM.744.8&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.au=Kumar%2C+R.&rft.aulast=Kumar&rft.aufirst=R.&rft.date=2017&rft.title=Key+Engineering+Materials&rft.pages=8-14&rft.atitle=Influence+of+metakaolin%2C+fly+ash+and+nano+silica+on+mechanical+and+durability+properties+of+concrete&rft.isbn=9783035711165&rft.volume=744+74&rft.issn=10139826&rft.genre=article