@article{Avila.ea.2003,
  author	= {Avila-Vilchis, J. C. and Brogliato, B. and Dzul, R. and Lozano, R.},
  title		= {Nonlinear modelling and control of helicopters},
  journal	= {Automatica},
  year		= {2003},
  volume	= {39},
  number	= {9},
  pages		= {1583--1596},
}