pid type title authors mentors source_title published_date url doi isbn issn eissn gfos:889 "journal article" "Alkali-activated fly ash concrete : concrete without cement" "Mikoč, Miroslav; Bjelobrk, Ivan; Korajac, Josip" gfos:890 "journal article" "Influence of slag, fly ash and silica fume on the mechanical and physical properties of asphalt" "Mikoč, Miroslav; Marković, Dalibor"