[Bożym M., Wacławek W.: Problem zagospodarowania Osadów ściekowych w Polsce, Krajach Unii Europejskiej i USA. Chemia Dydaktyka Ekologia Metrologia (Polish). 2000, 5, 105.]Search in Google Scholar
[Bień, J., Kempa E.: Gospodarka osadami z oczyszczalni ścieków, inżynieria środowiska stan obecny i perspektywy rozwoju. Monografie Komitetu Ochrony środowiska PAN (Polish). 2002, 10, 323.]Search in Google Scholar
[EU considers tighter sludge spreading rules, CEEP Scope Newsletter. 2000, 37, 2.]Search in Google Scholar
[Dulley B.: Recycling phosphorus by recovery from sewage. Second International Conference on the recovery of phosphorus from sewage and animal wastes, 12 - 13 march 2001 http://www.nhm.ac.uk/mineralogy/phos/Duley.doc]Search in Google Scholar
[Andersen A.: "Disposal and recycling routes for sewage sludge" report for the UE Commission-DG-Environment-B/2, SEDES. http://europa.eu.int/comm/environment/waste/sludge/sludge_disposal.htm]Search in Google Scholar
[Takahashi M., Kato S., Shima H., Sarai E., Ichioka T., Hatykawa S., Miyajiri H.: Technology for recovering phosphorus from incinerated wastewater treatment sludge. Chemosphere. 2001, 44, 23.]Search in Google Scholar
[Jozuka T.: P-recovery from sewage sludge incineration ash. CEEP Scope Newsletter. 2001, 43, 7.]Search in Google Scholar
[Suzuki Y.: P-recovery from sewage-sludge incineration ash. CEEP Scope Newsletter. 2003, 52, 4]Search in Google Scholar
[Nakahara: et al. Method for recovering phosphorus from organic sludge. US Patent 6,022,514. 2000]Search in Google Scholar
[Wzorek Z., Jodko M., Gorazda K., Rzepecki T.: Extraction of phosphorus compounds from ashes from thermal processing of sewage sludge. J. Loss. Prevent. Proc. 2006, 19, 39.]Search in Google Scholar
[Gorazda K., Kowalski Z., Wzorek Z., Jodko M., Rzepecki T., Kulczycka J., Przewrocki P.: Possibilities of phosphorus recovering from municipal sewage sludge. Pol. J. Appl. Chem. 2003, 2, 51.]Search in Google Scholar
[Kowalski Z., Wzorek Z., Jodko M., Gorazda K., Przewrocki P., Kulczycka J.: Thermal utylization of sewage sludge in Poland. Miner. Energ. 2003, 2, 34.]Search in Google Scholar
[Gorazda K., Kowalski Z., Wzorek Z., Jodko M.: Phosphorus compound extraction from ash after the sewage sludge combustion. Pol. J. Chem. Technol. 2005, 7, 24.]Search in Google Scholar
[Rzechuła J., Hupka J.: Charakterystyka i możliwości zagospodarowania popiołów i żużli ze spalania odpadów. Paliwa z Odpadów (Polish). 2003, 5, 243.]Search in Google Scholar
[Data of Główny Urząd statystyczny (Polish), 2002. / unpublished/]Search in Google Scholar
[Steen I.: Phosphorus availability in the 21st century: Management of a non-renewable resources, Phosphorus Potassium. 1998, 217, 25.]Search in Google Scholar
[Driver J., Lijmbach D., Steen I.: Why recover phosphorus for recycling, and how?. Environ. Technol. 1999, 20, 651.]Search in Google Scholar