@article{Car-Fal-For-Mon-2008,
    author={Elisabetta Carlini and Maurizio Falcone and Nicolas Forcadel 
           and Régis Monneau },
    title={Convergence of a Generalized Fast Marching Method for a 
           non-convex eikonal equation },
    journal={SIAM journal on numerical analysis },
    year={2008 },
    volume={46, 4 },
    pages={2920--2952},
}