1. Advancing Sustainable Materials Management 2014 Fact Sheet;U.S. Environmental Protection Agency,2016
2. NRDC, Wasted How America Is Losing Up to 40 Percent of Its Food from Farm to Fork to Landfill, 2012. https://www.nrdc.org/sites/default/files/wasted-food-IP.pdf.
3. USDA, Manure nutrients relative to the capacity of cropland and pastureland to assimilate nutrients: spatial and temporal trends for the United States, 2000. http://www.nrcs.usda.gov/Internet/FSE_DOCUMENTS/nrcs143_012133. pdf.
4. Hydrothermal liquefaction of sewage sludge under isothermal and fast conditions;Qian;Bioresour. Technol.,2017
5. Influence of pH on hydrothermal treatment of swine manure: impact on extraction of nitrogen and phosphorus in process water;Ekpo;Bioresour. Technol.,2016