7Miller G. Farm sustainability and animal feedlot enforcement act [J/OL]. (1999-02-10). http://www.gpo.gov/fdsys/pkg/BILLS-105hr3232ih/content-detail.html.
8Belsky A J, Matzke A, Uselman S. Survey of livestock influences on stream and riparian ecosystems in the western United States [J]. Journal of Soil and Water Conservation, 1999, 54(1): 419-431.
9Pell A N. Integrated crop-livestock management systems in sub- Saharan Africa [J]. Environment, Development and Sustainability, 1999, 1(3-4): 337-348.
10Choudhary M, Bailey L D, Grant C A. Review of the use of swine manure in crop production: effects on yield and composition and on soil and water quality [J]. Waste Management & Research, 1996, 14(6): 581-595.
