%0 Journal Article %A J. L. Simovljevitch %T Estimate of Perturbation Effects of Asteroid Orbits During Proximity %J Publications of the Department of Astronomy %D 1979 %P 75 - 78 %V 9 %N 1 %I mathdoc %U http://geodesic.mathdoc.fr/item/PDA_1979_9_1_a8/ %F PDA_1979_9_1_a8