@inproceedings{Bon-Cai-Duj-2007-1,
    author={Bernard Bonnard and Jean-Baptiste Caillau and Romain Dujol },
    title={Smooth homotopies for single-input time optimal orbital 
           transfer. },
    organization={Proceedings of the 13th IFAC Workshop on Control Applications 
           of Optimisation },
    booktitle={Int. J. Tomogr. Stat. },
    year={2007 },
    volume={5(W07) },
    pages={26--31},
}