“Optimisasi Produksi Biogas Dari Limbah Lateks Cair Pekat Dengan Penambahan Logam Optimization of Biogas Production from Concentrated-Latex Effluent With Addition of Metals”. 2016. Menara Perkebunan 76 (1). https://doi.org/10.22302/iribb.jur.mp.v76i1.92.