@inproceedings{attitudeoptimalbacksteppingcontroller,
  title = {Attitude Optimal Backstepping Controller Based Quaternion for a UAV},
  author = {Kaddouri Djamel},
  year = {2016},
  booktitle = {Advanced Control of Complex Dynamical Systems with Applications 2016 3},
  url = {https://www.hindawi.com/journals/mpe/2016/8573235/},
}