@article{Marigonda:2006n3,
  author = "Marigonda, Antonio",
  title = "{Second order controllability conditions for the controllability of control systems with drift}",
  doi = "10.22323/1.018.0012",
  journal = "PoS",
  year = 2006,
  volume = "CSTNA2005",
  pages = "012"
}