1.
Twardowski Ɓukasz. The role of the Vistula River as a border on the background of historical divisions of Poland and its importance in the current administrative division. SG [Internet]. 2015 Jan. 1 [cited 2025 Dec. 8];4:221-52. Available from: https://www.czasopisma.uni.lodz.pl/studiageogr/article/view/18520