1. Basic hydraulic pumps and circuit design;Tessmann,2000
2. Chapter five - actuators. Hydraul. Pneum;Parr,2011
3. Failure analysis;Lemberger,2000
4. Friction and wear measurement techniques;Axén;Mod Tribol Handb,2000
5. Tribological coatings: contact mechanisms and selection;Matthews;J Phys D Appl Phys,2007