@ARTICLE{Pogrebnova_Natalia_Estimation_2012, author={Pogrebnova, Natalia}, number={No 4}, 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={Estimation of factional properties of the disc brake working elements in order to increase efficiency of brake systems of the rolling stock}, }