Grotkiewicz, Katarzyna, Agnieszka Peszek, and Zbigniew Kowalczyk. “Verification of Economic and Agricultural Indicators With the Use of Statistical Methods on the Example of Individual Farms”. Agricultural Engineering 20, no. 3 (October 17, 2016): 43–51. Accessed April 19, 2024. https://agriceng.ptir.org/index.php/AgricEng/article/view/143.