Wieczerzyńska B. Proceedings regarding practices unfairly using a contractual advantage in the agri-food market as a new area of public administration. osap [Internet]. 2019 Sep. 16 [cited 2024 Dec. 4];16(1 (4):155-68. Available from: https://czasopisma.uni.opole.pl/index.php/osap/article/view/1168