BESLER, Gabriela and PORWOLIK, Marek. Karl Schröter and His Interest in Polish Mathematical Logic. Based on Unpublished Archival Documents. Logic and Logical Philosophy. Online. 6 September 2025. Vol. 34, no. 3, pp. 449-472. [Accessed 7 February 2026]. DOI 10.12775/LLP.2025.016.