@article{khalil_2009, 
  title={Interactive Analysis of Closed Loop Electro-hydraulic Control Systems}, 
  volume={13}, 
  DOI={10.21608/asat.2009.23753}, 
  number={AEROSPACE SCIENCES}, 
  publisher={Egypts Presidential Specialized Council for Education and Scientific Research}, 
  author={Khalil, Medhat}, 
  year={2009}, 
  month={May}
  }