P. Sztama, “The Case of Jan Matejczuk (1923–1950) – a Guard at the SS-Ausbildungslager Trawniki and an Officer of the Investigative Division of the Security Apparatus in ‘People’s’ Poland Through the Prism of Records Kept in the Archives of the Institute of National ”, arpl, no. 23, pp. 533–562, Dec. 2025.