Geodesic
Estimates of the Mutual Perturbations in the Orbital Elements of Some Interesting Quasicomplanar Minor Planets
Publications of the Department of Astronomy, Tome 11 (1981) no. 1.

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The calculus is performed of the first order perturbations is the motion of one minor planet, produced by another minor planet during their proximity, the conditions begin: the angles between the orbital planes of the given minor planets are under $0^\circ.500$, their proximity (minimum) distances do not exceed 0.000400 AU (60000 km), the perturbing minor planet masses are estimated as being grater than $10^{-13}$ of the solar mass and whose proximity duration is over half a day. The likely perturbing effects indicate that the interactions of the minor planets, taking place during proximity, might well be exploited for a more refined estimates of their masses. It proved that sensible changes appear in $\Omega$, $\omega$ and $M$. 
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     author = {J. Lazovi\'c and M. Kuzmanovski},
     title = {Estimates of the {Mutual} {Perturbations} in the {Orbital} {Elements} of {Some} {Interesting} {Quasicomplanar} {Minor} {Planets}},
     journal = {Publications of the Department of Astronomy},
     pages = {57 - 64},
     publisher = {mathdoc},
     volume = {11},
     number = {1},
     year = {1981},
     url = {http://geodesic.mathdoc.fr/item/PDA_1981_11_1_a7/}
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J. Lazović; M. Kuzmanovski. Estimates of the Mutual Perturbations in the Orbital Elements of Some Interesting Quasicomplanar Minor Planets. Publications of the Department of Astronomy, Tome 11 (1981) no. 1. http://geodesic.mathdoc.fr/item/PDA_1981_11_1_a7/