Kwaśniewski, Dariusz, Tadeusz Juliszewski, Józef Walczyk, Paweł Tylek, Florian Adamczyk, and Jan Szczepaniak. 2017. “Work Inputs and Costs of Eradication of Energy Willow Plantation”. Agricultural Engineering 20 (4), 137–146. https://doi.org/10.1515/agriceng-2016-0071.