@article{CRMATH_2007__345_6_319_0,
     author = {Bonnard, Bernard and Caillau, Jean-Baptiste},
     title = {Optimality results in orbit transfer},
     journal = {Comptes Rendus. Math\'ematique},
     pages = {319--324},
     publisher = {Elsevier},
     volume = {345},
     number = {6},
     year = {2007},
     doi = {10.1016/j.crma.2007.07.028},
     language = {en},
     url = {http://www.numdam.org/articles/10.1016/j.crma.2007.07.028/}
}