@ARTICLE{Izdebski_Waldemar_Impact_2012, author={Izdebski, Waldemar and Skudlarski, Jacek and Zając, Stanisław}, number={No 2}, journal={Teka Commission of Motorization and Power Industry in Agriculture}, howpublished={online}, year={2012}, publisher={The Lublin Branch of the Polish Academy of Sciences}, title={Impact of agricultural tractors advancement on productivity of selected machine units}, }