&XHYD GH ,QILHVWR (VSRVD GH &DFR GRQGH OH DOFDQ]y XQD ERPED PRUWDO )DOOHFH HQ OD *XHUUD &LYLO D FDXVD GHO D PL DEXHOD LPSDFWR GH XQD ERPED HVSRVD GH &DFR