@article{SJ_1962-1963__6__A8_0,
     author = {Ward, G. N.},
     title = {\'Equations intrins\`eques pour le mouvement des plan\`etes},
     journal = {S\'eminaire Janet. M\'ecanique analytique et m\'ecanique c\'eleste},
     note = {talk:12},
     pages = {1--9},
     publisher = {Secr\'etariat math\'ematique},
     volume = {6},
     year = {1962-1963},
     language = {fr},
     url = {http://www.numdam.org/item/SJ_1962-1963__6__A8_0/}
}