SPREADING RESISTANCE MODELLING FOR RAPID EXTRACTION OF CONTACT WITH A FOUR-POINT PROBESOLAR ENERGYPaperDeniz Turkay / Ergi Dönerçark / Konstantin Tsoi / Raşit Turan / Selçuk YERCİSPREADING RESISTANCE MODELLING FOR RAPID EXTRACTION OF CONTACT WITH A FOUR-POINT PROBE