@inproceedings{nissim_1989, 
  title={Effect of control surface mass unbalance on the stability of a closed-loop active control system}, 
  DOI={10.2514/6.1989-1211}, 
  publisher={American Institute of Aeronautics and Astronautics}, 
  author={NISSIM}, 
  year={1989}, 
  month={Apr}
  }