pid type title authors mentors source_title published_date url doi isbn issn eissn rgn:1987 dissertation "Origin, fate and transport modelling of nitrate in the Varaždin aquifer" "Karlović, Igor" rgn:608 dissertation "Integrirani hidrogeološko-hidrokemijski model Daruvarskog geotermalnog vodonosnika" "Borović, Staša"