Geodesic
Further Note on the Calculus of Perturbations of Asteroid Orbits During Proximity
Publications of the Department of Astronomy, Tome 9 (1979) no. 1 
J. L. Simovljevitch. Further Note on the Calculus of Perturbations of Asteroid Orbits During Proximity. Publications of the Department of Astronomy, Tome 9 (1979) no. 1. http://geodesic.mathdoc.fr/item/PDA_1979_9_1_a7/
@article{PDA_1979_9_1_a7,
     author = {J. L. Simovljevitch},
     title = {Further {Note} on the {Calculus} of {Perturbations} of {Asteroid} {Orbits} {During} {Proximity}},
     journal = {Publications of the Department of Astronomy},
     pages = {71 - 74},
     year = {1979},
     volume = {9},
     number = {1},
     url = {http://geodesic.mathdoc.fr/item/PDA_1979_9_1_a7/}
}
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Voir la notice de l'article provenant de la source eLibrary of Mathematical Institute of the Serbian Academy of Sciences and Arts

A simplification is made in calculations of relative coordinates of the perturbing asteroid during its proximity with the perturbed one.