Genetic studies on the Goths' expansion from South Scandinavia across Eastern Europe:

Wielbark Culture, the initial Gothic expansion into what is now Poland:
https://link.springer.com/article/10.1186/s13059-023-03013-9

The Maslomecz Group, a Wielbark population from southeast Poland:
https://pmc.ncbi.nlm.nih.gov/articles/PMC12924530/

Chernyakhov Culture of modern-day Ukraine; multiethnic society dominated by a Gothic elite, home to Scythians, Sarmatians, Thracians, Dacians, early Slavs, etc.:
https://www.science.org/doi/10.1126/sciadv.adr0695

Chernyakhov/Gothic expansion into the Balkans:
https://www.biorxiv.org/content/10.64898/2026.03.03.709317v2