Czech, Katarzyna, and Michał Wielechowski. “ARE AGRICULTURAL COMMODITY PRICES AFFECTED BY COVID-19? A STRUCTURAL BREAK IDENTIFICATION”. Proceedings of the International Scientific Conference "Economic Sciences for Agribusiness and Rural Economy", no. 4 (April 21, 2021). Accessed June 29, 2022. https://js.wne.sggw.pl/index.php/esare/article/view/5138.