Israel Science Foundation (Grants No. 221/05 and 1932/15)
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https://radar.ibiss.bg.ac.rs/APP/faces/project.xhtml?project_id=Israel+Science+Foundation+%28Grants+No.+221%2F05+and+1932%2F15%29&item_offset=0&author_offset=0&sort_by=dc.date.issued