“Pemanfaatan sistem rotary biological contactor menggunakan kultur Omphalina sp yang diimobilisasi pada tandan kosong kelapa sawit untuk absorbsi logam berat Cu2+ dan Hg2+ (Utilization of rotary biological contactor system using Omphalina sp immobilized on oil palm empty fruit bunch for absorption of heavy metals Cu2+ and Hg2+)”, MP, vol. 85, no. 2, Oct. 2017, doi: 10.22302/iribb.jur.mp.v85i2.255.