Xue, B., Zifu, L., Xuemei, W., Xi, H., Shikun, C., Xiaofeng, B., & Ruiling, G. (2017). Online measurement of alkalinity in anaerobic co-digestion using linear regression method. International Journal of Agricultural and Biological Engineering, 10(1), 176–183. https://doi.org/10.25165/ijabe.v10i1.2701