?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Adissertation&rft.aufirst=Hidayati&rft.aulast=Kumalasari&rft.au=Kumalasari%2C+Hidayati&rft.title=SINTESIS+SILIKA+GEL+DARI+ABU+LAYANG+BATUBARA+DAN+UJI+ADSORBSINYA+TERHADAP+ION+LOGAM+TIMBAL(II)&rft.inst=Fakultas+Matematika+dan+Ilmu+Pengetahuan+Alam&rft.degree=S1&rft.date=2011