?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.aulast=Nizar&rft.au=Nizar%2C+Umar+Kalmar&rft.aufirst=Umar+Kalmar&rft.pages=1-6&rft.atitle=Synthesis+and+Characterization+of+Silica-Titania+Catalyst+with+Solid-State+Technique+Applying+SiO%E2%82%82+and+TiO%E2%82%82+Solid+Precursors+Based+on+Variation+Time+of+Calcination+in+Biodiesel+Production&rft.date=2019&rft.issn=Online%3A+1742-6596&rft.title=Journal+of+Physics%3A+Conference+Series&rft.volume=1185&rft.genre=article