Wang, Xiao; Zheng, Lingfang; Zhang, Xuan; and Hao, Fanghua
"Agriculture Non-Point Source Phosphorus Loss Risk Assessment In Yellow River Basin By Modified Phosphorus Index,"
Proceedings of the Annual International Conference on Soils, Sediments, Water and Energy:
Vol. 14, Article 29.
Available at: http://scholarworks.umass.edu/soilsproceedings/vol14/iss1/29