@unpublished{zessner16[TUW-249279], author = {Zessner, Matthias and Egle, Lukas and Rechberger, Helmut}, title = {{S}ewage sludge as phosphorus resource and possibilities for phosphorus recovery with {A}ustria as example}, year = {2016}, note = {{V}ortrag: {F}irst {B}{W}{A} {C}onference on ''{W}{W}{T}{P} {S}ludge: {P}roblems and {S}olutions'', {S}ofia; 2016-05-10} }