Geodesic
Further Note on the Calculus of Perturbations of Asteroid Orbits During Proximity
Publications of the Department of Astronomy, Tome 9 (1979) no. 1.

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A simplification is made in calculations of relative coordinates of the perturbing asteroid during its proximity with the perturbed one. 
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     author = {J. L. Simovljevitch},
     title = {Further {Note} on the {Calculus} of {Perturbations} of {Asteroid} {Orbits} {During} {Proximity}},
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     pages = {71 - 74},
     publisher = {mathdoc},
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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/