@article{AIHPC_2007__24_3_395_0,
     author = {Bonnard, Bernard and Caillau, Jean-Baptiste},
     title = {Riemannian metric of the averaged energy minimization problem in orbital transfer with low thrust},
     journal = {Annales de l'I.H.P. Analyse non lin\'eaire},
     pages = {395--411},
     publisher = {Elsevier},
     volume = {24},
     number = {3},
     year = {2007},
     doi = {10.1016/j.anihpc.2006.03.013},
     mrnumber = {2319940},
     zbl = {1127.49017},
     language = {en},
     url = {http://www.numdam.org/articles/10.1016/j.anihpc.2006.03.013/}
}