@inproceedings{Jea-Kos-1997,
    author={Frédéric Jean and Pierre-Vincent Koseleff },
    title={Elementary Approximation of Exponentials of Lie Polynomials },
    doi={10.1007/3-540-63163-1_14 },
    organization={12th AAECC Symp. },
    year={1997 },
    volume={1255 },
    publisher={Springer (T. Mora and H. Mattson Eds.) },
}