(a) Schematic map of Serbia with the position of the wider studied area of Valjevo (western FSiegrbuirae; m1.a(rak)eSdchweimthatthicemreadpsqouf aSreer)b; i(ab)wGiteholtohgeicpaolsmitiaopnooffththeeswtuiddierdsatruedaiewditahrleeagoenf dV,aaljnedvoth(ewaerseta- ewrhneSreertbhiea;rom...