pid type title authors mentors source_title published_date url doi isbn issn eissn rgn:2173 "journal article" "Numerical groundwater flow and nitrate transport assessment in alluvial aquifer of Varaždin region, NW Croatia" "Karlović, Igor; Posavec, Kristijan; Larva, Ozren; Marković, Tamara" hgi:26 "journal article" "Groundwater age as an indicator of nitrate concentration evolution in aquifers affected by agricultural activities" "Brkić, Željka; Larva, Ozren; Kuhta, Mladen"