Inside University of Zagreb's largest research partnership: University of Ljubljana

Behind University of Zagreb's research output sits a defining relationship: 751 co-authored works with University of Ljubljana (Slovenia) in the five years to 2025, the university's single largest collaboration.

It anchors an unusually connected research base: 1,070 collaborating institutions across 78 countries, producing 33,699 joint works over the window, with international co-authors on 28% of output.

The collaborative work travels: its field-weighted citation impact stands at 1.76, where the world average is 1.0.

The Research Collaboration Index, the first global account of how universities actually collaborate, publishes its first full edition on Tuesday 15 September at 09:00 UK.

Every figure derives from the open global research record and is checkable at source.