1.
Szlachta-Kisiel K. Concepts of the material legal relationship of social insurance and the status of its entities as parties to the pre-trial proceedings in pension and disability matters. API [Internet]. 2025 Dec. 22 [cited 2026 Jun. 4];(4):132-45. Available from: https://api.upsl.edu.pl/index.php/ius/article/view/86