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Recently, there has been increasing demand to achieve very low effluent total phosphorus (TP) due to more stringent discharge limits imposed on wastewater treatment plants.
K. zu Guttenberg. Schriften zum internationalen Recht . - Berlin : Duncker u. Humblot;176 Duncker & Humblot, (2009)von Karl-Theodor Frhr zu Guttenberg.
P. Kennedy. Fischer-Verlag, Frankfurt am Main, (1991)erschien zuerst 1987 in den USA unter dem Titel "`The Rise and Fall of the Great Powers. Economic Change and Military Conflict from 1500 to 2000"'.