@inproceedings{erhard_weber_schoppel_2013, 
  title={Geometrical Design and Operability Verification of a Proportional Pressure Relief Valve}, 
  DOI={10.3384/ecp1392a36}, 
  publisher={Linköping University Electronic Press}, 
  author={Erhard and Weber and Schoppel}, 
  year={2013}, 
  month={Sep}
  }