Zhengjun, Guan, Sun Xianli, Bi Lanping, Li Wenzhe, Zhang Ying, and Wang Zhigang. 2016. “Two-Phase Anaerobic Co-Digestion of Dairy Manure With Swine Manure”. International Journal of Agricultural and Biological Engineering 9 (2):146-52. https://doi.org/10.25165/ijabe.v9i2.1637.