?url_ver=Z39.88-2004&rft_id=10.3390%2Fma14195496&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.au=Shahrul%2C+S.&rft.aulast=Shahrul&rft.aufirst=S.&rft.date=2021&rft.title=Materials&rft.atitle=Mechanical+properties+of+crumb+rubber+mortar+containing+nano-silica+using+response+surface+methodology&rft.volume=14&rft.issn=19961944&rft.issue=19&rft.genre=article