1. Boxall AB, Sinclair CJ, Fenner K, Kolpin D, Maund SJ. When synthetic chemicals degrade in the environment. Environ Sci Technol. 2004;38:368A–75A. doi:
10.1021/es040624v
.
2. Kroiss H, Rechberger H, Egle L. Phosphorus in water quality and waste management. Integr Waste Manag - Vol II. doi:
10.5772/18482
.
3. Evans TD. Sewage sludge: operational and environmental issues FR/R0001—review of Current Knowledge. Found Water Res. 2016;4th Edit.:1–46.
4. Council of the European Union. Council directive of 12 June 1986 on the protection of the environment, and in particular of the soil, when sewage sludge is used in agriculture.
5. U.S. EPA. e-CFR, Title 40: protection of environment, Part 503: standards for the use or disposal of sewage sludge, subpart B: land application.