The influence of the association patterns of phosphorus–substrates and xylene–substrates on the degradation of xylenes in an alluvial aquifer oleh SANJA MRKIC, PETAR A. PFENDT, BRANIMIR JOVANCICEVIC, IVAN MATI, SLOBODAN VUJASINOVIC, DANILO BABIC, MIROSLAV VRVIC, DRAGANA DJORDJEVIC, GORDANA GOJGIC-CVIJOVIC, PREDRAG NIKOLIC, GORDANA DEVIC, VALERIJA MATIC, DUBRAVKA RELIC, SNEZANA TRIFUNOVIC