@inproceedings{Bon-Cai-Duj-2007-2,
    author={Bernard Bonnard and Jean-Baptiste Caillau and Romain Dujol },
    title={Smooth approximations of single-input controlled Keplerian 
           trajectories: homotopies and averaging },
    organization={Proceedings of the Joint CTS-HYCON Workshop on Nonlinear and 
           Hybrid Control },
    booktitle={Taming heterogeneity and complexity of embedded control },
    year={2007 },
    pages={73--95},
    publisher={International Scientific and Technical Encyclopedia },
}