Inside University of Bremen's largest research partnership: Universität Hamburg

Behind University of Bremen's research output sits a defining relationship: 420 co-authored works with Universität Hamburg (Germany) in the five years to 2025, the university's single largest collaboration.

It anchors an unusually connected research base: 992 collaborating institutions across 77 countries, producing 24,491 joint works over the window, with international co-authors on 43% of output.

The collaborative work travels: its field-weighted citation impact stands at 2.62, 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.