4Hodson P N. Aerobic and anaerobic , treatment of slurries and other agricultureal wastes, Agricultural Waste Mamagement and Environmental Protection [A]. Proceeding of the 4 th international[C]. CIEC Symposium Brannschweig Germany, 1988,2.
5Wellinger A. Psychrophilic methane generation from pig manure[J]. Process Biochem, 1998, ( 11 ): 26 - 30.
6Santos J Q, Cangpos L S, ernandes E F. Upgrading of agricultural and agro-industrial waste , Agricultural Waste Management and Environmental Protection[J]. CIEC Symposium, Braunsehweig Germany, 1998,2: 117- 123.
