Ristić Vakanjac, V., S. Prohaska, D. Polomčić, B. Blagojević, and B. Vakanjac. “Karst Aquifer Average Catchment Area Assessment through Monthly Water Balance Equation With Limited Meteorological Data Set: Application to Grza Spring in Eastern Serbia”. Acta Carsologica, vol. 42, no. 1, Sept. 2013, doi:10.3986/ac.v42i1.642.