Search for: [References = "Kowalski, M. \(2020\). The Early Mediaeval Slav\-German border \(Limes Sorabicus\) in the light of research into Y\-chromosome polymorphism in contemporary and historical German populations, Geographia Polonica, 93\(4\), 569‑596\; doi\: https\:\/\/doi.org\/10.7163\/GPol.0190"]