Optimization of cellulase production by bacillus sp. BPPT CC RK2 with pH and temperature variation using response surface methodologyMisri Gozan, Andre Fahriz Harahap, Chandra Paska Bakti and Siswa SetyahadiE3S Web Conf., 67 (2018) 02051DOI: https://doi.org/10.1051/e3sconf/20186702051