1.
Kapusta P. The basis for calculating social security contributions of workers and persons running economic activity outside agriculture and their being called into question by the social insurance institution. osap [Internet]. 2019 May 31 [cited 2024 Nov. 2];16(1 (2):143-57. Available from: https://czasopisma.uni.opole.pl/index.php/osap/article/view/1135