MODEL MATEMATIKA UNTUK ANALISIS KUANTITATIF PRODUKSI PLANT GROWTH-PROMMOTING RHIZOBACTERIA DALAM LOW-COST SUBSTRAT DENGAN PROSES ANAEROB Mathematical Model for Quantitative Analysis of Plant Growth-Promotting Rhizobacteria’s Production on Low-Cost Substra - Budianto, Gregorius Prima Indra (Universitas Wahid Hasyim, 2016)