@ARTICLE{Rey_Anton_Anvilless_2013,
 author={Rey, Anton and Yuriy Gut'ko},
 number={No 3},
 journal={Teka Commission of Motorization and Power Industry in Agriculture},
 howpublished={online},
 year={2013},
 publisher={The Lublin Branch of the Polish Academy of Sciences},
 title={Anvilless hydraulic hammer with double-sided drive and increasedlower ram mass},
}